CINXE.COM

Standard Reference Materials | NIST

<!DOCTYPE html> <html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://www.nist.gov/srm","20230314214432","https://web.archive.org/","web","/_static/", "1678830272"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link rel="stylesheet" type="text/css" href="/_static/css/iconochive.css?v=3PDvdIFv" /> <!-- End Wayback Rewrite JS Include --> <meta charset="utf-8"/><script type="text/javascript">(window.NREUM||(NREUM={})).init={ajax:{deny_list:["gov-bam.nr-data.net"]}};(window.NREUM||(NREUM={})).loader_config={licenseKey:"37b7ccb661",applicationID:"1089704227"};;(()=>{var e,t,r={9071:(e,t,r)=>{"use strict";r.d(t,{I:()=>n});var n=0,i=navigator.userAgent.match(/Firefox[\/\s](\d+\.\d+)/);i&&(n=+i[1])},6562:(e,t,r)=>{"use strict";r.d(t,{P_:()=>v,Mt:()=>h,C5:()=>d,DL:()=>y,OP:()=>R,lF:()=>L,Yu:()=>A,Dg:()=>p,CX:()=>f,GE:()=>w,sU:()=>M});var n={};r.r(n),r.d(n,{agent:()=>x,match:()=>O,version:()=>T});var i=r(6797),o=r(909),a=r(8610);class s{constructor(e,t){try{if(!e||"object"!=typeof e)return(0,a.Z)("New setting a Configurable requires an object as input");if(!t||"object"!=typeof t)return(0,a.Z)("Setting a Configurable requires a model to set its initial properties");Object.assign(this,t),Object.entries(e).forEach((e=>{let[t,r]=e;const n=(0,o.q)(t);n.length&&r&&"object"==typeof r&&n.forEach((e=>{e in r&&((0,a.Z)('"'.concat(e,'" is a protected attribute and can not be changed in feature ').concat(t,". It will have no effect.")),delete r[e])})),this[t]=r}))}catch(e){(0,a.Z)("An error occured while setting a Configurable",e)}}}const c={beacon:i.ce.beacon,errorBeacon:i.ce.errorBeacon,licenseKey:void 0,applicationID:void 0,sa:void 0,queueTime:void 0,applicationTime:void 0,ttGuid:void 0,user:void 0,account:void 0,product:void 0,extra:void 0,jsAttributes:{},userAttributes:void 0,atts:void 0,transactionName:void 0,tNamePlain:void 0},u={};function d(e){if(!e)throw new Error("All info objects require an agent identifier!");if(!u[e])throw new Error("Info for ".concat(e," was never set"));return u[e]}function f(e,t){if(!e)throw new Error("All info objects require an agent identifier!");u[e]=new s(t,c),(0,i.Qy)(e,u[e],"info")}const l={allow_bfcache:!0,privacy:{cookies_enabled:!0},ajax:{deny_list:void 0,enabled:!0,harvestTimeSeconds:10},distributed_tracing:{enabled:void 0,exclude_newrelic_header:void 0,cors_use_newrelic_header:void 0,cors_use_tracecontext_headers:void 0,allowed_origins:void 0},ssl:void 0,obfuscate:void 0,jserrors:{enabled:!0,harvestTimeSeconds:10},metrics:{enabled:!0},page_action:{enabled:!0,harvestTimeSeconds:30},page_view_event:{enabled:!0},page_view_timing:{enabled:!0,harvestTimeSeconds:30,long_task:!1},session_trace:{enabled:!0,harvestTimeSeconds:10},spa:{enabled:!0,harvestTimeSeconds:10}},g={};function v(e){if(!e)throw new Error("All configuration objects require an agent identifier!");if(!g[e])throw new Error("Configuration for ".concat(e," was never set"));return g[e]}function p(e,t){if(!e)throw new Error("All configuration objects require an agent identifier!");g[e]=new s(t,l),(0,i.Qy)(e,g[e],"config")}function h(e,t){if(!e)throw new Error("All configuration objects require an agent identifier!");var r=v(e);if(r){for(var n=t.split("."),i=0;i<n.length-1;i++)if("object"!=typeof(r=r[n[i]]))return;r=r[n[n.length-1]]}return r}const m={accountID:void 0,trustKey:void 0,agentID:void 0,licenseKey:void 0,applicationID:void 0,xpid:void 0},b={};function y(e){if(!e)throw new Error("All loader-config objects require an agent identifier!");if(!b[e])throw new Error("LoaderConfig for ".concat(e," was never set"));return b[e]}function w(e,t){if(!e)throw new Error("All loader-config objects require an agent identifier!");b[e]=new s(t,m),(0,i.Qy)(e,b[e],"loader_config")}const A=(0,i.mF)().o;var E=r(2053),x=null,T=null;if(navigator.userAgent){var _=navigator.userAgent,D=_.match(/Version\/(\S+)\s+Safari/);D&&-1===_.indexOf("Chrome")&&-1===_.indexOf("Chromium")&&(x="Safari",T=D[1])}function O(e,t){if(!x)return!1;if(e!==x)return!1;if(!t)return!0;if(!T)return!1;for(var r=T.split("."),n=t.split("."),i=0;i<n.length;i++)if(n[i]!==r[i])return!1;return!0}var j=r(5526),k=r(2374);const P="NRBA_SESSION_ID";function S(){if(!k.il)return null;try{let e;return null===(e=window.sessionStorage.getItem(P))&&(e=(0,j.ky)(16),window.sessionStorage.setItem(P,e)),e}catch(e){return null}}var I=r(8226);const C=e=>({customTransaction:void 0,disabled:!1,isolatedBacklog:!1,loaderType:void 0,maxBytes:3e4,offset:(0,E.yf)(),onerror:void 0,origin:""+k._A.location,ptid:void 0,releaseIds:{},sessionId:1==h(e,"privacy.cookies_enabled")?S():null,xhrWrappable:"function"==typeof k._A.XMLHttpRequest?.prototype?.addEventListener,userAgent:n,version:I.q}),N={};function R(e){if(!e)throw new Error("All runtime objects require an agent identifier!");if(!N[e])throw new Error("Runtime for ".concat(e," was never set"));return N[e]}function M(e,t){if(!e)throw new Error("All runtime objects require an agent identifier!");N[e]=new s(t,C(e)),(0,i.Qy)(e,N[e],"runtime")}function L(e){return function(e){try{const t=d(e);return!!t.licenseKey&&!!t.errorBeacon&&!!t.applicationID}catch(e){return!1}}(e)}},8226:(e,t,r)=>{"use strict";r.d(t,{q:()=>n});const n="1227.PROD"},9557:(e,t,r)=>{"use strict";r.d(t,{w:()=>o});var n=r(8610);const i={agentIdentifier:""};class o{constructor(e){try{if("object"!=typeof e)return(0,n.Z)("shared context requires an object as input");this.sharedContext={},Object.assign(this.sharedContext,i),Object.entries(e).forEach((e=>{let[t,r]=e;Object.keys(i).includes(t)&&(this.sharedContext[t]=r)}))}catch(e){(0,n.Z)("An error occured while setting SharedContext",e)}}}},4329:(e,t,r)=>{"use strict";r.d(t,{L:()=>d,R:()=>c});var n=r(3752),i=r(7022),o=r(4045),a=r(2325);const s={};function c(e,t){const r={staged:!1,priority:a.p[t]||0};u(e),s[e].get(t)||s[e].set(t,r)}function u(e){e&&(s[e]||(s[e]=new Map))}function d(){let e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:"",t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:"feature";if(u(e),!e||!s[e].get(t))return a(t);s[e].get(t).staged=!0;const r=Array.from(s[e]);function a(t){const r=e?n.ee.get(e):n.ee,a=o.X.handlers;if(r.backlog&&a){var s=r.backlog[t],c=a[t];if(c){for(var u=0;s&&u<s.length;++u)f(s[u],c);(0,i.D)(c,(function(e,t){(0,i.D)(t,(function(t,r){r[0].on(e,r[1])}))}))}delete a[t],r.backlog[t]=null,r.emit("drain-"+t,[])}}r.every((e=>{let[t,r]=e;return r.staged}))&&(r.sort(((e,t)=>e[1].priority-t[1].priority)),r.forEach((e=>{let[t]=e;a(t)})))}function f(e,t){var r=e[1];(0,i.D)(t[r],(function(t,r){var n=e[0];if(r[0]===n){var i=r[1],o=e[3],a=e[2];i.apply(o,a)}}))}},3752:(e,t,r)=>{"use strict";r.d(t,{ee:()=>u});var n=r(6797),i=r(3916),o=r(7022),a=r(6562),s="nr@context";let c=(0,n.fP)();var u;function d(){}function f(){return new d}function l(){u.aborted=!0,u.backlog={}}c.ee?u=c.ee:(u=function e(t,r){var n={},c={},g={},v=!1;try{v=16===r.length&&(0,a.OP)(r).isolatedBacklog}catch(e){}var p={on:b,addEventListener:b,removeEventListener:y,emit:m,get:A,listeners:w,context:h,buffer:E,abort:l,aborted:!1,isBuffering:x,debugId:r,backlog:v?{}:t&&"object"==typeof t.backlog?t.backlog:{}};return p;function h(e){return e&&e instanceof d?e:e?(0,i.X)(e,s,f):f()}function m(e,r,n,i,o){if(!1!==o&&(o=!0),!u.aborted||i){t&&o&&t.emit(e,r,n);for(var a=h(n),s=w(e),d=s.length,f=0;f<d;f++)s[f].apply(a,r);var l=T()[c[e]];return l&&l.push([p,e,r,a]),a}}function b(e,t){n[e]=w(e).concat(t)}function y(e,t){var r=n[e];if(r)for(var i=0;i<r.length;i++)r[i]===t&&r.splice(i,1)}function w(e){return n[e]||[]}function A(t){return g[t]=g[t]||e(p,t)}function E(e,t){var r=T();p.aborted||(0,o.D)(e,(function(e,n){t=t||"feature",c[n]=t,t in r||(r[t]=[])}))}function x(e){return!!T()[c[e]]}function T(){return p.backlog}}(void 0,"globalEE"),c.ee=u)},9252:(e,t,r)=>{"use strict";r.d(t,{E:()=>n,p:()=>i});var n=r(3752).ee.get("handle");function i(e,t,r,i,o){o?(o.buffer([e],i),o.emit(e,t,r)):(n.buffer([e],i),n.emit(e,t,r))}},4045:(e,t,r)=>{"use strict";r.d(t,{X:()=>o});var n=r(9252);o.on=a;var i=o.handlers={};function o(e,t,r,o){a(o||n.E,i,e,t,r)}function a(e,t,r,i,o){o||(o="feature"),e||(e=n.E);var a=t[o]=t[o]||{};(a[r]=a[r]||[]).push([e,i])}},8544:(e,t,r)=>{"use strict";r.d(t,{bP:()=>s,iz:()=>c,m$:()=>a});var n=r(2374);let i=!1,o=!1;try{const e={get passive(){return i=!0,!1},get signal(){return o=!0,!1}};n._A.addEventListener("test",null,e),n._A.removeEventListener("test",null,e)}catch(e){}function a(e,t){return i||o?{capture:!!e,passive:i,signal:t}:!!e}function s(e,t){let r=arguments.length>2&&void 0!==arguments[2]&&arguments[2];window.addEventListener(e,t,a(r))}function c(e,t){let r=arguments.length>2&&void 0!==arguments[2]&&arguments[2];document.addEventListener(e,t,a(r))}},5526:(e,t,r)=>{"use strict";r.d(t,{Rl:()=>i,ky:()=>o});var n=r(2374);function i(){var e=null,t=0,r=n._A?.crypto||n._A?.msCrypto;function i(){return e?15&e[t++]:16*Math.random()|0}r&&r.getRandomValues&&(e=r.getRandomValues(new Uint8Array(31)));for(var o,a="xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx",s="",c=0;c<a.length;c++)s+="x"===(o=a[c])?i().toString(16):"y"===o?(o=3&i()|8).toString(16):o;return s}function o(e){var t=null,r=0,n=self.crypto||self.msCrypto;n&&n.getRandomValues&&Uint8Array&&(t=n.getRandomValues(new Uint8Array(31)));for(var i=[],o=0;o<e;o++)i.push(a().toString(16));return i.join("");function a(){return t?15&t[r++]:16*Math.random()|0}}},2053:(e,t,r)=>{"use strict";r.d(t,{nb:()=>s,os:()=>c,yf:()=>a,zO:()=>o});var n=(new Date).getTime(),i=n;function o(){return performance?.now?Math.round(performance.now()):(n=Math.max((new Date).getTime(),n))-i}function a(){return n}function s(e){i=e}function c(){return i}},6625:(e,t,r)=>{"use strict";r.d(t,{s:()=>a,v:()=>s});var n=r(8283),i=r(2053),o=r(2374);let a=!0;function s(e){var t=function(){a=!1;const e=o._A?.performance?.timeOrigin||o._A?.performance?.timing?.navigationStart;if(!e)return;return Math.round(e)}();t&&((0,n.B)(e,"starttime",t),(0,i.nb)(t))}},8283:(e,t,r)=>{"use strict";r.d(t,{B:()=>o,L:()=>a});var n=r(2053),i={};function o(e,t,r){void 0===r&&(r=(0,n.zO)()+(0,n.os)()),i[e]=i[e]||{},i[e][t]=r}function a(e,t,r,n){const o=e.sharedContext.agentIdentifier;var a=i[o]?.[r],s=i[o]?.[n];void 0!==a&&void 0!==s&&e.store("measures",t,{value:s-a})}},2545:(e,t,r)=>{"use strict";r.d(t,{L:()=>c});var n=r(9071),i=r(8544),o=r(8305),a=r(2374),s=r(6998);if(a.v6){a._A.cleanupTasks=[];const e=a._A.close;a._A.close=()=>{for(let e of a._A.cleanupTasks)e();e()}}function c(e,t){if(a.il)if(t)(0,s.N)(e,!0),(0,i.bP)("pagehide",e);else{var r=(0,o.Z)(e);!n.I||navigator.sendBeacon?(0,i.bP)("pagehide",r):(0,i.bP)("beforeunload",r),(0,i.bP)("unload",r)}else a.v6&&a._A.cleanupTasks.push(e)}},8610:(e,t,r)=>{"use strict";function n(e,t){console&&console.warn&&"function"==typeof console.warn&&(console.warn("New Relic: ".concat(e)),t&&console.warn(t))}r.d(t,{Z:()=>n})},3916:(e,t,r)=>{"use strict";r.d(t,{X:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t,r){if(n.call(e,t))return e[t];var i=r();if(Object.defineProperty&&Object.keys)try{return Object.defineProperty(e,t,{value:i,writable:!0,enumerable:!1}),i}catch(e){}return e[t]=i,i}},2374:(e,t,r)=>{"use strict";r.d(t,{_A:()=>o,il:()=>n,lW:()=>a,v6:()=>i});const n=Boolean("undefined"!=typeof window&&window.document),i=Boolean("undefined"!=typeof WorkerGlobalScope&&self.navigator instanceof WorkerNavigator);let o=(()=>{if(n)return window;if(i){if("undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope)return globalThis;if(self instanceof WorkerGlobalScope)return self}throw new Error('New Relic browser agent shutting down due to error: Unable to locate global scope. This is possibly due to code redefining browser global variables like "self" and "window".')})();function a(){return o}},7022:(e,t,r)=>{"use strict";r.d(t,{D:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t){var r=[],i="",o=0;for(i in e)n.call(e,i)&&(r[o]=t(i,e[i]),o+=1);return r}},8305:(e,t,r)=>{"use strict";r.d(t,{Z:()=>o});var n=r(8683),i=r.n(n);function o(e){var t,r=!1;return function(){return r?t:(r=!0,t=e.apply(this,i()(arguments)))}}},2650:(e,t,r)=>{"use strict";r.d(t,{K:()=>a,b:()=>o});var n=r(8544);function i(){return"undefined"==typeof document||"complete"===document.readyState}function o(e,t){if(i())return e();(0,n.bP)("load",e,t)}function a(e){if(i())return e();(0,n.iz)("DOMContentLoaded",e)}},6797:(e,t,r)=>{"use strict";r.d(t,{EZ:()=>u,Qy:()=>c,ce:()=>o,fP:()=>a,gG:()=>d,mF:()=>s});var n=r(2053),i=r(2374);const o={beacon:"bam.nr-data.net",errorBeacon:"bam.nr-data.net"};function a(){return i._A.NREUM||(i._A.NREUM={}),void 0===i._A.newrelic&&(i._A.newrelic=i._A.NREUM),i._A.NREUM}function s(){let e=a();return e.o||(e.o={ST:i._A.setTimeout,SI:i._A.setImmediate,CT:i._A.clearTimeout,XHR:i._A.XMLHttpRequest,REQ:i._A.Request,EV:i._A.Event,PR:i._A.Promise,MO:i._A.MutationObserver,FETCH:i._A.fetch}),e}function c(e,t,r){let i=a();const o=i.initializedAgents||{},s=o[e]||{};return Object.keys(s).length||(s.initializedAt={ms:(0,n.zO)(),date:new Date}),i.initializedAgents={...o,[e]:{...s,[r]:t}},i}function u(e,t){a()[e]=t}function d(){return function(){let e=a();const t=e.info||{};e.info={beacon:o.beacon,errorBeacon:o.errorBeacon,...t}}(),function(){let e=a();const t=e.init||{};e.init={...t}}(),s(),function(){let e=a();const t=e.loader_config||{};e.loader_config={...t}}(),a()}},6998:(e,t,r)=>{"use strict";r.d(t,{N:()=>i,e:()=>o});var n=r(8544);function i(e){let t=arguments.length>1&&void 0!==arguments[1]&&arguments[1];return void(0,n.iz)("visibilitychange",(function(){if(t){if("hidden"!=document.visibilityState)return;e()}e(document.visibilityState)}))}function o(){return"hidden"===document.visibilityState?-1:1/0}},6034:(e,t,r)=>{"use strict";r.d(t,{gF:()=>o,mY:()=>i,t9:()=>n,vz:()=>s,xS:()=>a});const n=r(2325).D.metrics,i="sm",o="cm",a="storeSupportabilityMetrics",s="storeEventMetrics"},2484:(e,t,r)=>{"use strict";r.d(t,{t:()=>n});const n=r(2325).D.pageViewEvent},6382:(e,t,r)=>{"use strict";r.d(t,{t:()=>n});const n=r(2325).D.pageViewTiming},1509:(e,t,r)=>{"use strict";r.d(t,{W:()=>s});var n=r(6562),i=r(3752),o=r(2384),a=r(6797);class s{constructor(e,t,r){this.agentIdentifier=e,this.aggregator=t,this.ee=i.ee.get(e,(0,n.OP)(this.agentIdentifier).isolatedBacklog),this.featureName=r,this.blocked=!1,this.checkConfiguration()}checkConfiguration(){if(!(0,n.lF)(this.agentIdentifier)){let e={...(0,a.gG)().info?.jsAttributes};try{e={...e,...(0,n.C5)(this.agentIdentifier)?.jsAttributes}}catch(e){}(0,o.j)(this.agentIdentifier,{...(0,a.gG)(),info:{...(0,a.gG)().info,jsAttributes:e}})}}}},2384:(e,t,r)=>{"use strict";r.d(t,{j:()=>w});var n=r(8683),i=r.n(n),o=r(2325),a=r(6562),s=r(9252),c=r(7022),u=r(3752),d=r(2053),f=r(4329),l=r(2650),g=r(2374),v=r(8610),p=r(6034);function h(e){["setErrorHandler","finished","addToTrace","inlineHit","addRelease","addPageAction","setCurrentRouteName","setPageViewName","setCustomAttribute","interaction","noticeError"].forEach((t=>{e[t]=function(){for(var r=arguments.length,n=new Array(r),i=0;i<r;i++)n[i]=arguments[i];return function(t){for(var r=arguments.length,n=new Array(r>1?r-1:0),i=1;i<r;i++)n[i-1]=arguments[i];Object.values(e.initializedAgents).forEach((e=>{e.exposed&&e.api[t]&&e.api[t](...n)}))}(t,...n)}}))}var m=r(6797);const b={stn:[o.D.sessionTrace],err:[o.D.jserrors,o.D.metrics],ins:[o.D.pageAction],spa:[o.D.spa]};const y={};function w(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=arguments.length>2?arguments[2]:void 0,w=arguments.length>3?arguments[3]:void 0,{init:A,info:E,loader_config:x,runtime:T={loaderType:n},exposed:_=!0}=t;const D=(0,m.gG)();let O={};return E||(A=D.init,E=D.info,x=D.loader_config,O=D),g.v6&&(E.jsAttributes={...E.jsAttributes,isWorker:!0}),(0,a.CX)(e,E),(0,a.Dg)(e,A||{}),(0,a.GE)(e,x||{}),(0,a.sU)(e,T),function(e,t,n){n||(0,f.R)(e,"api"),h(t);var m=u.ee.get(e),b=m.get("tracer"),y="api-",w=y+"ixn-";function A(){}(0,c.D)(["setErrorHandler","finished","addToTrace","inlineHit","addRelease"],(function(e,r){t[r]=x(y,r,!0,"api")})),t.addPageAction=x(y,"addPageAction",!0,o.D.pageAction),t.setCurrentRouteName=x(y,"routeName",!0,o.D.spa),t.setPageViewName=function(t,r){if("string"==typeof t)return"/"!==t.charAt(0)&&(t="/"+t),(0,a.OP)(e).customTransaction=(r||"https://web.archive.org/web/20230314214432/http://custom.transaction")+t,x(y,"setPageViewName",!0,"api")()},t.setCustomAttribute=function(t,r){const n=(0,a.C5)(e);return(0,a.CX)(e,{...n,jsAttributes:{...n.jsAttributes,[t]:r}}),x(y,"setCustomAttribute",!0,"api")()},t.interaction=function(){return(new A).get()};var E=A.prototype={createTracer:function(e,t){var r={},n=this,i="function"==typeof t;return(0,s.p)(w+"tracer",[(0,d.zO)(),e,r],n,o.D.spa,m),function(){if(b.emit((i?"":"no-")+"fn-start",[(0,d.zO)(),n,i],r),i)try{return t.apply(this,arguments)}catch(e){throw b.emit("fn-err",[arguments,this,"string"==typeof e?new Error(e):e],r),e}finally{b.emit("fn-end",[(0,d.zO)()],r)}}}};function x(e,t,r,n){return function(){return(0,s.p)(p.xS,["API/"+t+"/called"],void 0,o.D.metrics,m),(0,s.p)(e+t,[(0,d.zO)()].concat(i()(arguments)),r?null:this,n,m),r?void 0:this}}function T(){r.e(439).then(r.bind(r,5692)).then((t=>{let{setAPI:r}=t;r(e),(0,f.L)(e,"api")})).catch((()=>(0,v.Z)("Downloading runtime APIs failed...")))}(0,c.D)("actionText,setName,setAttribute,save,ignore,onEnd,getContext,end,get".split(","),(function(e,t){E[t]=x(w,t,void 0,o.D.spa)})),t.noticeError=function(e,t){"string"==typeof e&&(e=new Error(e)),(0,s.p)(p.xS,["API/noticeError/called"],void 0,o.D.metrics,m),(0,s.p)("err",[e,(0,d.zO)(),!1,t],void 0,o.D.jserrors,m)},g.v6?T():(0,l.b)((()=>T()),!0)}(e,O,w),(0,m.Qy)(e,D,"api"),(0,m.Qy)(e,_,"exposed"),(0,m.EZ)("activatedFeatures",y),(0,m.EZ)("setToken",(t=>function(e,t){var r=u.ee.get(t);e&&"object"==typeof e&&((0,c.D)(e,(function(e,t){if(!t)return(b[e]||[]).forEach((t=>{(0,s.p)("block-"+e,[],void 0,t,r)}));y[e]||((0,s.p)("feat-"+e,[],void 0,b[e],r),y[e]=!0)})),(0,f.L)(t,o.D.pageViewEvent))}(t,e))),O}},909:(e,t,r)=>{"use strict";r.d(t,{Z:()=>i,q:()=>o});var n=r(2325);function i(e){switch(e){case n.D.ajax:return[n.D.jserrors];case n.D.sessionTrace:return[n.D.ajax,n.D.pageViewEvent];case n.D.pageViewTiming:return[n.D.pageViewEvent];default:return[]}}function o(e){return e===n.D.jserrors?[]:["auto"]}},2325:(e,t,r)=>{"use strict";r.d(t,{D:()=>n,p:()=>i});const n={ajax:"ajax",jserrors:"jserrors",metrics:"metrics",pageAction:"page_action",pageViewEvent:"page_view_event",pageViewTiming:"page_view_timing",sessionTrace:"session_trace",spa:"spa"},i={[n.pageViewEvent]:1,[n.pageViewTiming]:2,[n.metrics]:3,[n.jserrors]:4,[n.ajax]:5,[n.sessionTrace]:6,[n.pageAction]:7,[n.spa]:8}},8683:e=>{e.exports=function(e,t,r){t||(t=0),void 0===r&&(r=e?e.length:0);for(var n=-1,i=r-t||0,o=Array(i<0?0:i);++n<i;)o[n]=e[t+n];return o}}},n={};function i(e){var t=n[e];if(void 0!==t)return t.exports;var o=n[e]={exports:{}};return r[e](o,o.exports,i),o.exports}i.m=r,i.n=e=>{var t=e&&e.__esModule?()=>e.default:()=>e;return i.d(t,{a:t}),t},i.d=(e,t)=>{for(var r in t)i.o(t,r)&&!i.o(e,r)&&Object.defineProperty(e,r,{enumerable:!0,get:t[r]})},i.f={},i.e=e=>Promise.all(Object.keys(i.f).reduce(((t,r)=>(i.f[r](e,t),t)),[])),i.u=e=>(({78:"page_action-aggregate",147:"metrics-aggregate",193:"session_trace-aggregate",317:"jserrors-aggregate",348:"page_view_timing-aggregate",439:"async-api",729:"lazy-loader",786:"page_view_event-aggregate",873:"spa-aggregate",898:"ajax-aggregate"}[e]||e)+"."+{78:"2f41aaf7",147:"28086cfb",178:"52056f28",193:"545db67a",317:"941c6e17",348:"a7d9d7be",439:"737e0ca6",729:"540ab0d1",786:"2ae3c96c",873:"494130b7",898:"52cc993d"}[e]+"-1227.min.js"),i.o=(e,t)=>Object.prototype.hasOwnProperty.call(e,t),e={},t="NRBA:",i.l=(r,n,o,a)=>{if(e[r])e[r].push(n);else{var s,c;if(void 0!==o)for(var u=document.getElementsByTagName("script"),d=0;d<u.length;d++){var f=u[d];if(f.getAttribute("src")==r||f.getAttribute("data-webpack")==t+o){s=f;break}}s||(c=!0,(s=document.createElement("script")).charset="utf-8",s.timeout=120,i.nc&&s.setAttribute("nonce",i.nc),s.setAttribute("data-webpack",t+o),s.src=r),e[r]=[n];var l=(t,n)=>{s.onerror=s.onload=null,clearTimeout(g);var i=e[r];if(delete e[r],s.parentNode&&s.parentNode.removeChild(s),i&&i.forEach((e=>e(n))),t)return t(n)},g=setTimeout(l.bind(null,void 0,{type:"timeout",target:s}),12e4);s.onerror=l.bind(null,s.onerror),s.onload=l.bind(null,s.onload),c&&document.head.appendChild(s)}},i.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},i.p="https://web.archive.org/web/20230314214432/https://js-agent.newrelic.com/",(()=>{var e={703:0,946:0};i.f.j=(t,r)=>{var n=i.o(e,t)?e[t]:void 0;if(0!==n)if(n)r.push(n[2]);else{var o=new Promise(((r,i)=>n=e[t]=[r,i]));r.push(n[2]=o);var a=i.p+i.u(t),s=new Error;i.l(a,(r=>{if(i.o(e,t)&&(0!==(n=e[t])&&(e[t]=void 0),n)){var o=r&&("load"===r.type?"missing":r.type),a=r&&r.target&&r.target.src;s.message="Loading chunk "+t+" failed.\n("+o+": "+a+")",s.name="ChunkLoadError",s.type=o,s.request=a,n[1](s)}}),"chunk-"+t,t)}};var t=(t,r)=>{var n,o,[a,s,c]=r,u=0;if(a.some((t=>0!==e[t]))){for(n in s)i.o(s,n)&&(i.m[n]=s[n]);if(c)c(i)}for(t&&t(r);u<a.length;u++)o=a[u],i.o(e,o)&&e[o]&&e[o][0](),e[o]=0},r=window.webpackChunkNRBA=window.webpackChunkNRBA||[];r.forEach(t.bind(null,0)),r.push=t.bind(null,r.push.bind(r))})();var o={};(()=>{"use strict";i.r(o);var e=i(2325),t=i(6562);const r=Object.values(e.D);function n(e){const n={};return r.forEach((r=>{n[r]=function(e,r){return!1!==(0,t.Mt)(r,"".concat(e,".enabled"))}(r,e)})),n}var a=i(2384),s=i(909),c=i(9252),u=i(2053),d=i(8283),f=i(6625),l=i(4329),g=i(1509),v=i(2650),p=i(2374),h=i(8610);class m extends g.W{constructor(e,t,r){let n=!(arguments.length>3&&void 0!==arguments[3])||arguments[3];super(e,t,r),this.hasAggregator=!1,this.auto=n,this.abortHandler,n&&(0,l.R)(e,r)}importAggregator(){if(this.hasAggregator||!this.auto)return;this.hasAggregator=!0;const e=async()=>{try{const{lazyLoader:e}=await i.e(729).then(i.bind(i,8110)),{Aggregate:t}=await e(this.featureName,"aggregate");new t(this.agentIdentifier,this.aggregator)}catch(e){(0,h.Z)("Downloading ".concat(this.featureName," failed...")),this.abortHandler?.()}};p.v6?e():(0,v.b)((()=>e()),!0)}}var b,y,w,A=i(2484);class E extends m{constructor(e,t){let r=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];super(e,t,A.t,r),(0,f.v)(e),(0,d.B)(e,"firstbyte",(0,u.yf)()),(0,v.K)((()=>this.measureDomContentLoaded())),(0,v.b)((()=>this.measureWindowLoaded()),!0),this.importAggregator()}measureWindowLoaded(){var t=(0,u.zO)();(0,d.B)(this.agentIdentifier,"onload",t+(0,u.os)()),(0,c.p)("timing",["load",t],void 0,e.D.pageViewTiming,this.ee)}measureDomContentLoaded(){(0,d.B)(this.agentIdentifier,"domContent",(0,u.zO)()+(0,u.os)())}}b=E,y="featureName",w=A.t,(y=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var r=e[Symbol.toPrimitive];if(void 0!==r){var n=r.call(e,t||"default");if("object"!=typeof n)return n;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(y))in b?Object.defineProperty(b,y,{value:w,enumerable:!0,configurable:!0,writable:!0}):b[y]=w;var x=i(9557),T=i(7022);class _ extends x.w{constructor(e){super(e),this.aggregatedData={}}store(e,t,r,n,i){var o=this.getBucket(e,t,r,i);return o.metrics=function(e,t){t||(t={count:0});return t.count+=1,(0,T.D)(e,(function(e,r){t[e]=D(r,t[e])})),t}(n,o.metrics),o}merge(e,t,r,n,i){var o=this.getBucket(e,t,n,i);if(o.metrics){var a=o.metrics;a.count+=r.count,(0,T.D)(r,(function(e,t){if("count"!==e){var n=a[e],i=r[e];i&&!i.c?a[e]=D(i.t,n):a[e]=function(e,t){if(!t)return e;t.c||(t=O(t.t));return t.min=Math.min(e.min,t.min),t.max=Math.max(e.max,t.max),t.t+=e.t,t.sos+=e.sos,t.c+=e.c,t}(i,a[e])}}))}else o.metrics=r}storeMetric(e,t,r,n){var i=this.getBucket(e,t,r);return i.stats=D(n,i.stats),i}getBucket(e,t,r,n){this.aggregatedData[e]||(this.aggregatedData[e]={});var i=this.aggregatedData[e][t];return i||(i=this.aggregatedData[e][t]={params:r||{}},n&&(i.custom=n)),i}get(e,t){return t?this.aggregatedData[e]&&this.aggregatedData[e][t]:this.aggregatedData[e]}take(e){for(var t={},r="",n=!1,i=0;i<e.length;i++)t[r=e[i]]=j(this.aggregatedData[r]),t[r].length&&(n=!0),delete this.aggregatedData[r];return n?t:null}}function D(e,t){return null==e?function(e){e?e.c++:e={c:1};return e}(t):t?(t.c||(t=O(t.t)),t.c+=1,t.t+=e,t.sos+=e*e,e>t.max&&(t.max=e),e<t.min&&(t.min=e),t):{t:e}}function O(e){return{t:e,min:e,max:e,sos:e*e,c:1}}function j(e){return"object"!=typeof e?[]:(0,T.D)(e,k)}function k(e,t){return t}var P=i(6797),S=i(5526);var I,C=i(6998),N=i(8544),R=i(6382),M=-1,L=function(e){addEventListener("pageshow",(function(t){t.persisted&&(M=t.timeStamp,e(t))}),!0)},B=function(){return window.performance&&performance.getEntriesByType&&performance.getEntriesByType("navigation")[0]},z=function(){var e=B();return e&&e.activationStart||0},V=function(e,t){var r=B(),n="navigate";return M>=0?n="back-forward-cache":r&&(n=document.prerendering||z()>0?"prerender":document.wasDiscarded?"restore":r.type.replace(/_/g,"-")),{name:e,value:void 0===t?-1:t,rating:"good",delta:0,entries:[],id:"v3-".concat(Date.now(),"-").concat(Math.floor(8999999999999*Math.random())+1e12),navigationType:n}},W=function(e,t,r){try{if(PerformanceObserver.supportedEntryTypes.includes(e)){var n=new PerformanceObserver((function(e){Promise.resolve().then((function(){t(e.getEntries())}))}));return n.observe(Object.assign({type:e,buffered:!0},r||{})),n}}catch(e){}},q=function(e,t){var r=function r(n){"pagehide"!==n.type&&"hidden"!==document.visibilityState||(e(n),t&&(removeEventListener("visibilitychange",r,!0),removeEventListener("pagehide",r,!0)))};addEventListener("visibilitychange",r,!0),addEventListener("pagehide",r,!0)},Z=function(e,t,r,n){var i,o;return function(a){t.value>=0&&(a||n)&&((o=t.value-(i||0))||void 0===i)&&(i=t.value,t.delta=o,t.rating=function(e,t){return e>t[1]?"poor":e>t[0]?"needs-improvement":"good"}(t.value,r),e(t))}},H=function(e){document.prerendering?addEventListener("prerenderingchange",(function(){return e()}),!0):e()},F=(new Date,0),U=1/0,G=0,X=function(e){e.forEach((function(e){e.interactionId&&(U=Math.min(U,e.interactionId),G=Math.max(G,e.interactionId),F=G?(G-U)/7+1:0)}))},Q=function(){return I?F:performance.interactionCount||0},K=function(){"interactionCount"in performance||I||(I=W("event",X,{type:"event",buffered:!0,durationThreshold:0}))},Y=0,J=function(){return Q()-Y},$=[],ee={},te=function(e){var t=$[$.length-1],r=ee[e.interactionId];if(r||$.length<10||e.duration>t.latency){if(r)r.entries.push(e),r.latency=Math.max(r.latency,e.duration);else{var n={id:e.interactionId,latency:e.duration,entries:[e]};ee[n.id]=n,$.push(n)}$.sort((function(e,t){return t.latency-e.latency})),$.splice(10).forEach((function(e){delete ee[e.id]}))}},re=i(2545);class ne extends m{constructor(r,n){var i;let o=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];if(super(r,n,R.t,o),i=this,p.il){if(this.pageHiddenTime=(0,C.e)(),this.performanceObserver,this.lcpPerformanceObserver,this.clsPerformanceObserver,this.fiRecorded=!1,"PerformanceObserver"in window&&"function"==typeof window.PerformanceObserver){this.performanceObserver=new PerformanceObserver((function(){return i.perfObserver(...arguments)}));try{this.performanceObserver.observe({entryTypes:["paint"]})}catch(e){}this.lcpPerformanceObserver=new PerformanceObserver((function(){return i.lcpObserver(...arguments)}));try{this.lcpPerformanceObserver.observe({entryTypes:["largest-contentful-paint"]})}catch(e){}this.clsPerformanceObserver=new PerformanceObserver((function(){return i.clsObserver(...arguments)}));try{this.clsPerformanceObserver.observe({type:"layout-shift",buffered:!0})}catch(e){}}this.fiRecorded=!1;["click","keydown","mousedown","pointerdown","touchstart"].forEach((e=>{(0,N.iz)(e,(function(){return i.captureInteraction(...arguments)}))})),function(e,t){t=t||{},H((function(){var r=[200,500];K();var n,i=V("INP"),o=function(e){e.forEach((function(e){e.interactionId&&te(e),"first-input"===e.entryType&&!$.some((function(t){return t.entries.some((function(t){return e.duration===t.duration&&e.startTime===t.startTime}))}))&&te(e)}));var t,r=(t=Math.min($.length-1,Math.floor(J()/50)),$[t]);r&&r.latency!==i.value&&(i.value=r.latency,i.entries=r.entries,n())},a=W("event",o,{durationThreshold:t.durationThreshold||40});n=Z(e,i,r,t.reportAllChanges),a&&(a.observe({type:"first-input",buffered:!0}),q((function(){o(a.takeRecords()),i.value<0&&J()>0&&(i.value=0,i.entries=[]),n(!0)})),L((function(){$=[],Y=Q(),i=V("INP"),n=Z(e,i,r,t.reportAllChanges)})))}))}((t=>{let{name:r,value:n,id:i}=t;(0,c.p)("timing",[r.toLowerCase(),n,{metricId:i}],void 0,e.D.pageViewTiming,this.ee)})),!0===(0,t.Mt)(this.agentIdentifier,"page_view_timing.long_task")&&(e=>{const t=t=>{t.forEach((t=>{const r={name:"LT",value:t.duration,info:{ltFrame:t.name,ltStart:t.startTime,ltCtr:t.attribution[0].containerType}};"window"!==r.info.ltCtr&&Object.assign(r.info,{ltCtrSrc:t.attribution[0].containerSrc,ltCtrId:t.attribution[0].containerId,ltCtrName:t.attribution[0].containerName}),e(r)}))};let r;try{PerformanceObserver.supportedEntryTypes.includes("longtask")&&(r=new PerformanceObserver((e=>{Promise.resolve().then((()=>{t(e.getEntries())}))})),r.observe({type:"longtask",buffered:!0}))}catch(e){}r&&(0,re.L)((()=>{t(r.takeRecords())}),!0)})((t=>{let{name:r,value:n,info:i}=t;(0,c.p)("timing",[r.toLowerCase(),n,i],void 0,e.D.pageViewTiming,this.ee)})),(0,C.N)((()=>{this.pageHiddenTime=(0,u.zO)(),(0,c.p)("docHidden",[this.pageHiddenTime],void 0,e.D.pageViewTiming,this.ee)}),!0),(0,N.bP)("pagehide",(()=>(0,c.p)("winPagehide",[(0,u.zO)()],void 0,e.D.pageViewTiming,this.ee))),this.importAggregator()}}perfObserver(t,r){t.getEntries().forEach((t=>{"first-paint"===t.name?(0,c.p)("timing",["fp",Math.floor(t.startTime)],void 0,e.D.pageViewTiming,this.ee):"first-contentful-paint"===t.name&&(0,c.p)("timing",["fcp",Math.floor(t.startTime)],void 0,e.D.pageViewTiming,this.ee)}))}lcpObserver(t,r){var n=t.getEntries();if(n.length>0){var i=n[n.length-1];if(this.pageHiddenTime<i.startTime)return;var o=[i],a=this.addConnectionAttributes({});a&&o.push(a),(0,c.p)("lcp",o,void 0,e.D.pageViewTiming,this.ee)}}clsObserver(t){t.getEntries().forEach((t=>{t.hadRecentInput||(0,c.p)("cls",[t],void 0,e.D.pageViewTiming,this.ee)}))}addConnectionAttributes(e){var t=navigator.connection||navigator.mozConnection||navigator.webkitConnection;if(t)return t.type&&(e["net-type"]=t.type),t.effectiveType&&(e["net-etype"]=t.effectiveType),t.rtt&&(e["net-rtt"]=t.rtt),t.downlink&&(e["net-dlink"]=t.downlink),e}captureInteraction(r){if(r instanceof t.Yu.EV&&!this.fiRecorded){var n=Math.round(r.timeStamp),i={type:r.type};this.addConnectionAttributes(i),n<=(0,u.zO)()?i.fid=(0,u.zO)()-n:n>(0,u.os)()&&n<=Date.now()?(n-=(0,u.os)(),i.fid=(0,u.zO)()-n):n=(0,u.zO)(),this.fiRecorded=!0,(0,c.p)("timing",["fi",n,i],void 0,e.D.pageViewTiming,this.ee)}}}!function(e,t,r){(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var r=e[Symbol.toPrimitive];if(void 0!==r){var n=r.call(e,t||"default");if("object"!=typeof n)return n;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r}(ne,"featureName",R.t);const ie={dedicated:Boolean(p._A?.Worker),shared:Boolean(p._A?.SharedWorker),service:Boolean(p._A?.navigator?.serviceWorker)};let oe,ae,se;var ce=i(6034);class ue extends m{constructor(t,r){let n=!(arguments.length>2&&void 0!==arguments[2])||arguments[2];super(t,r,ce.t9,n),function(e){if(!oe){if(ie.dedicated){oe=Worker;try{p._A.Worker=r(oe,"Dedicated")}catch(e){o(e,"Dedicated")}if(ie.shared){ae=SharedWorker;try{p._A.SharedWorker=r(ae,"Shared")}catch(e){o(e,"Shared")}}else n("Shared");if(ie.service){se=navigator.serviceWorker.register;try{p._A.navigator.serviceWorker.register=(t=se,function(){for(var e=arguments.length,r=new Array(e),n=0;n<e;n++)r[n]=arguments[n];return i("Service",r[1]?.type),t.apply(navigator.serviceWorker,r)})}catch(e){o(e,"Service")}}else n("Service");var t;return}n("All")}function r(e,t){return"undefined"==typeof Proxy?e:new Proxy(e,{construct:(e,r)=>(i(t,r[1]?.type),new e(...r))})}function n(t){p.v6||e("Workers/".concat(t,"/Unavailable"))}function i(t,r){e("Workers/".concat(t,"module"===r?"/Module":"/Classic"))}function o(t,r){e("Workers/".concat(r,"/SM/Unsupported")),(0,h.Z)("NR Agent: Unable to capture ".concat(r," workers."),t)}}((t=>(0,c.p)(ce.xS,[t],void 0,e.D.metrics,this.ee))),this.importAggregator()}}!function(e,t,r){(t=function(e){var t=function(e,t){if("object"!=typeof e||null===e)return e;var r=e[Symbol.toPrimitive];if(void 0!==r){var n=r.call(e,t||"default");if("object"!=typeof n)return n;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===t?String:Number)(e)}(e,"string");return"symbol"==typeof t?t:String(t)}(t))in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r}(ue,"featureName",ce.t9),new class{constructor(e){let t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:(0,S.ky)(16);this.agentIdentifier=t,this.sharedAggregator=new _({agentIdentifier:this.agentIdentifier}),this.features={},this.desiredFeatures=new Set(e.features||[]),this.desiredFeatures.add(E),Object.assign(this,(0,a.j)(this.agentIdentifier,e,e.loaderType||"agent")),this.start()}get config(){return{info:(0,t.C5)(this.agentIdentifier),init:(0,t.P_)(this.agentIdentifier),loader_config:(0,t.DL)(this.agentIdentifier),runtime:(0,t.OP)(this.agentIdentifier)}}start(){const t="features";try{const r=n(this.agentIdentifier),i=Array.from(this.desiredFeatures);i.sort(((t,r)=>e.p[t.featureName]-e.p[r.featureName])),i.forEach((t=>{if(r[t.featureName]||t.featureName===e.D.pageViewEvent){const e=(0,s.Z)(t.featureName),n=e.every((e=>r[e]));n||(0,h.Z)("".concat(t.featureName," is enabled but one or more dependent features has been disabled (").concat(JSON.stringify(e),"). This may cause unintended consequences or missing data...")),this.features[t.featureName]=new t(this.agentIdentifier,this.sharedAggregator)}})),(0,P.Qy)(this.agentIdentifier,this.features,t)}catch(e){(0,h.Z)("Failed to initialize all enabled instrument classes (agent aborted) -",e);for(const e in this.features)this.features[e].abortHandler?.();const r=(0,P.fP)();return delete r.initializedAgents[this.agentIdentifier]?.api,delete r.initializedAgents[this.agentIdentifier]?.[t],delete this.sharedAggregator,r.ee?.abort(),delete r.ee?.get(this.agentIdentifier),!1}}}({features:[E,ne,ue],loaderType:"lite"})})(),window.NRBA=o})();</script> <noscript><style>form.antibot * :not(.antibot-message) { display: none !important; }</style> </noscript><script async src="https://web.archive.org/web/20230314214432js_/https://www.googletagmanager.com/gtag/js?id=UA-66610693-3"></script> <script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments)};gtag("js", new Date());gtag("set", "developer_id.dMDhkMT", true);gtag('set', {cookie_flags: 'SameSite=None;Secure'});gtag("config", "UA-66610693-3", {"groups":"default","anonymize_ip":true,"page_placeholder":"PLACEHOLDER_page_path","link_attribution":true,"allow_ad_personalization_signals":false,"custom_map":{"dimension2":"node_title","dimension3":"node_id","dimension7":"content_type"}});gtag("config", "G-HEQ0YF2VYL", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("config", "UA-33523145-1", {"groups":"default","anonymize_ip":true,"page_placeholder":"PLACEHOLDER_page_path","link_attribution":true,"allow_ad_personalization_signals":false,"custom_map":{"dimension2":"node_title","dimension3":"node_id","dimension7":"content_type"}});gtag("event", "custom", {"node_title":"Standard Reference Materials","node_id":"419246","content_type":"Laboratory\/Organizational Unit"});</script> <link rel="canonical" href="https://web.archive.org/web/20230314214432/https://www.nist.gov/srm"/> <link rel="shortlink" href="https://web.archive.org/web/20230314214432/https://www.nist.gov/node/419246"/> <meta name="description" content="NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both."/> <meta name="dcterms.title" content="Standard Reference Materials"/> <meta name="dcterms.description" content="NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both."/> <meta name="dcterms.date" content="2012-11-06T11:22-05:00"/> <meta name="dcterms.type" content="text"/> <meta name="dcterms.format" content="text/html"/> <meta name="dcterms.identifier" content="https://www.nist.gov/srm"/> <meta name="dcterms.source" content="NIST"/> <meta name="dcterms.created" content="2012-11-06T11:22-05:00"/> <meta name="dcterms.modified" content="2023-03-01T12:00-05:00"/> <meta name="citation_title" content="Standard Reference Materials | NIST"/> <meta property="og:site_name" content="NIST"/> <meta property="og:type" content="Article"/> <meta property="og:url" content="https://web.archive.org/web/20230314214432/https://www.nist.gov/srm"/> <meta property="og:title" content="Standard Reference Materials"/> <meta property="og:description" content="NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both."/> <meta property="article:published_time" content="2012-11-06T11:22-05:00"/> <meta property="article:modified_time" content="2023-03-01T12:00-05:00"/> <meta name="google-site-verification" content="QMu0ODkER3rN5hLcMLqNVf7e3bkjYsNLTuhqfH48jCA"/> <meta name="twitter:card" content="summary_large_image"/> <meta name="twitter:site" content="NIST"/> <meta name="twitter:description" content="NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both."/> <meta name="twitter:title" content="Standard Reference Materials"/> <meta name="twitter:url" content="https://web.archive.org/web/20230314214432im_/https://www.nist.gov/srm"/> <meta name="Generator" content="Drupal 9 (https://www.drupal.org)"/> <meta name="MobileOptimized" content="width"/> <meta name="HandheldFriendly" content="true"/> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <meta name="nist_search_modified" class="elastic" content="2023-03-01T12:00:00-05:00"/> <script type="application/ld+json">{ "@context": "https://web.archive.org/web/20230314214432/https://schema.org", "@graph": [ { "@type": "Article", "headline": "Standard Reference Materials | NIST", "description": "\u003Cp\u003ENIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both.\u003C/p\u003E", "image": { "@type": "ImageObject", "representativeOfPage": "True" }, "datePublished": "2012-11-06T11:22-05:00", "dateModified": "2023-03-01T12:00-05:00" } ] }</script> <meta name="nist_search_bundle" class="elastic" content="laboratory_organizational_unit"/> <link rel="icon" href="/web/20230314214432im_/https://www.nist.gov/themes/custom/nist_www/favicon.ico" type="image/vnd.microsoft.icon"/> <title>Standard Reference Materials | NIST</title> <link rel="stylesheet" media="all" href="/web/20230314214432cs_/https://www.nist.gov/sites/default/files/css/css_F2gAVVlSdR3arDUpXp31o79SNgjcEodwd2bnXsnktzU.css"/> <link rel="stylesheet" media="screen" href="/web/20230314214432cs_/https://www.nist.gov/sites/default/files/css/css_gD8QmGaNfUQuThtjB-S0EwEOZZNJP1QfUU1bDdLHbMU.css"/> <link rel="stylesheet" media="print" href="/web/20230314214432cs_/https://www.nist.gov/sites/default/files/css/css_zbjDhj-AmeVwgu9y0DlPwEfp7l-a5BpoK3MpoGmRB6o.css"/> <link rel="stylesheet" media="all" href="/web/20230314214432cs_/https://www.nist.gov/sites/default/files/css/css_PV0KmreUx3hVeYI6yGypf71UDz9BSQl1Z5DjiESDh-Y.css"/> <link rel="stylesheet" media="screen" href="/web/20230314214432cs_/https://www.nist.gov/sites/default/files/css/css_dXhP8gFSR5hd16LUS1TrwJ15l9WTOxqff1l1a5ojF4o.css"/> <script src="/web/20230314214432js_/https://www.nist.gov/sites/default/files/js/js_VDwaIMNiRtzQn-NZvj1F9loIzJ-i4yEDiruzS8Z6Ejo.js"></script> </head> <body class="node-419246"> <a href="#main-content" class="visually-hidden focusable" data-elastic-exclude> Skip to main content </a> <div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas> <!-- nist-index-ignore-start --> <section data-elastic-exclude class="usa-banner" aria-label="Official government website"> <div class="usa-accordion"> <header class="usa-banner__header"> <div class="usa-banner__inner"> <div class="grid-col-auto"> <img class="usa-banner__header-flag" src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/us_flag_small.png" alt="U.S. flag"> </div> <div class="grid-col-fill tablet:grid-col-auto"> <p class="usa-banner__header-text">An official website of the United States government</p> <p class="usa-banner__header-action" aria-hidden="true">Here鈥檚 how you know</p> </div> <button class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner-default"> <span class="usa-banner__button-text">Here鈥檚 how you know</span> </button> </div> </header> <div class="usa-banner__content usa-accordion__content" id="gov-banner-default"> <div class="grid-row grid-gap-lg"> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true"> <div class="usa-media-block__body"> <p> <strong>Official websites use .gov</strong> <br/> A <strong>.gov</strong> website belongs to an official government organization in the United States. </p> </div> </div> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/icon-https.svg" role="img" alt="" aria-hidden="true"> <div class="usa-media-block__body"> <p> <strong>Secure .gov websites use HTTPS</strong> <br/> A <strong>lock</strong> ( <span class="icon-lock"> <svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewbox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-title banner-lock-description" focusable="false"> <title id="banner-lock-title">Lock</title> <desc id="banner-lock-description">A locked padlock</desc><path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z"/></svg> </span> ) or <strong>https://</strong> means you鈥檝e safely connected to the .gov website. Share sensitive information only on official, secure websites. </p> </div> </div> </div> </div> </div> </section> <!-- nist-index-ignore-end --> <div data-elastic-exclude> <!-- nist-index-ignore-start --> <div class="nist-print-header" style="display:none;"> <p class="nist-print-header__url">https://www.nist.gov/srm</p> <img class="nist-print-header__logo" width="289" height="38" src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/nist_logo_sidestack.svg" alt="National Institute of Standards and Technology"/> </div> <div class="usa-overlay"></div> <header class="usa-header nist-header--www nist-header--minimal" role="banner"> <div class="usa-navbar"> <div class="usa-logo flex-fill"> <a href="/web/20230314214432/https://www.nist.gov/" title="National Institute of Standards and Technology" aria-label="Home"> <img src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/logo.svg" alt="National Institute of Standards and Technology" width="300px" height="80px"/> </a> </div> <div class="usa-header__right grid-row flex-auto"> <div class="grid-col-fill nist-header__search-group"> <form class="usa-search usa-search--small" accept-charset="UTF-8" action="/web/20230314214432/https://www.nist.gov/search" id="search_form" method="get"> <div role="search"> <label class="usa-sr-only" for="search-form">Search NIST</label> <input class="usa-input" id="search-form" type="search" name="s" placeholder="Search NIST" required="" maxlength="128"> <button class="usa-button" type="submit"><img src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/usa-icons-bg/search--white.svg" class="usa-search__submit-icon" alt="Search"></button> </div> </form> </div> <div class="grid-col-auto padding-left-1"> <button class="usa-menu-btn">Menu</button> </div> </div> </div> <nav aria-label="Primary navigation" class="usa-nav"> <div class="usa-nav__inner"> <button class="usa-nav__close">Close</button> <ul class="usa-nav__primary usa-accordion"> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-1"><span>Topics</span></button> <div id="primary_menu-1" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/topics" class="usa-nav__link">All Topics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/advanced-communications" class="usa-nav__link">Advanced communications</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/bioscience" class="usa-nav__link">Bioscience</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/buildings-construction" class="usa-nav__link">Buildings and construction</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/chemistry" class="usa-nav__link">Chemistry</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/climate" class="usa-nav__link">Climate</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/cybersecurity" class="usa-nav__link">Cybersecurity</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/electronics" class="usa-nav__link">Electronics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/energy" class="usa-nav__link">Energy</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/environment" class="usa-nav__link">Environment</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/fire" class="usa-nav__link">Fire</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/forensic-science" class="usa-nav__link">Forensic science</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/health" class="usa-nav__link">Health</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/information-technology" class="usa-nav__link">Information technology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/infrastructure" class="usa-nav__link">Infrastructure</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/manufacturing" class="usa-nav__link">Manufacturing</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/materials" class="usa-nav__link">Materials</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/metrology" class="usa-nav__link">Metrology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/nanotechnology" class="usa-nav__link">Nanotechnology</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/neutron-research" class="usa-nav__link">Neutron research</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/performance-excellence" class="usa-nav__link">Performance excellence</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/physics" class="usa-nav__link">Physics</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/public-safety" class="usa-nav__link">Public safety</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/resilience" class="usa-nav__link">Resilience</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/standards" class="usa-nav__link">Standards</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/transportation" class="usa-nav__link">Transportation</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <a class="usa-nav__link" href="/web/20230314214432/https://www.nist.gov/publications">Publications</a> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs &amp; Major Programs</span></button> <div id="primary_menu-3" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/labs-major-programs/laboratories" class="usa-nav__link">Laboratories</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230314214432/https://www.nist.gov/ctl" class="usa-nav__link">Communications Technology Laboratory</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/el" class="usa-nav__link">Engineering Laboratory</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/itl" class="usa-nav__link">Information Technology Laboratory</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/mml" class="usa-nav__link">Material Measurement Laboratory</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/pml" class="usa-nav__link">Physical Measurement Laboratory</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/labs-major-programs/user-facilities" class="usa-nav__link">User Facilities</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230314214432/https://www.nist.gov/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/cnst" class="usa-nav__link">CNST NanoFab</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/laboratories/projects-programs" class="usa-nav__link">Research Projects</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/laboratories/tools-instruments" class="usa-nav__link">Tools &amp; Instruments</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/labs-major-programs/major-programs" class="usa-nav__link">Major Programs</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230314214432/https://www.nist.gov/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/chips" class="usa-nav__link">CHIPS for America Initiative</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/oam" class="usa-nav__link">Office of Advanced Manufacturing</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/spo" class="usa-nav__link">Special Programs Office</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/tpo" class="usa-nav__link">Technology Partnerships Office</a> </li> </ul> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="primary_menu-4"><span>Services &amp; Resources</span></button> <div id="primary_menu-4" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/services-resources/standards-and-measurements" class="usa-nav__link usa-current">Standards and Measurements</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230314214432/https://www.nist.gov/calibrations" class="usa-nav__link">Calibration Services</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/nist-quality-system" class="usa-nav__link">Quality System</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/srm" class="usa-nav__link usa-current">Standard Reference Materials (SRMs)</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/standardsgov" class="usa-nav__link">Standards.gov</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/pml/owm" class="usa-nav__link">Office of Weights and Measures</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/services-resources/software" class="usa-nav__link">Software</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/data" class="usa-nav__link">Data</a> <ul class="usa-nav__submenu-list"> <li> <a href="https://web.archive.org/web/20230314214432/https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a> </li> <li> <a href="https://web.archive.org/web/20230314214432/https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/srd" class="usa-nav__link">Standard Reference Data (SRD)</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/shop" class="usa-nav__link">Storefront</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/tpo" class="usa-nav__link">License &amp; Patents</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="https://web.archive.org/web/20230314214432/https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/nist-research-library" class="usa-nav__link">NIST Research Library</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News &amp; Events</span></button> <div id="primary_menu-5" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/news-events/news" class="usa-nav__link">News</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/news-events/events" class="usa-nav__link">Events</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/blogs" class="usa-nav__link">Blogs</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/feature-stories" class="usa-nav__link">Feature Stories</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/awards" class="usa-nav__link">Awards</a> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/video-gallery" class="usa-nav__link">Video Gallery</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/image-gallery" class="usa-nav__link">Image Gallery</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/director/pao/media-contacts" class="usa-nav__link">Media Contacts</a> </li> </ul> </div> </div> </div> </li> <li class="usa-nav__primary-item"> <button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button> <div id="primary_menu-6" class="usa-nav__submenu usa-megamenu"> <div class="grid-row"> <div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/about-nist" class="usa-nav__link">About Us</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/about-nist/contact-us" class="usa-nav__link">Contact Us</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/about-nist/visit" class="usa-nav__link">Visit</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/careers" class="usa-nav__link">Careers</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/director/nist-organization-structure" class="usa-nav__link">Our Organization</a> <ul class="usa-nav__submenu-list"> <li> <a href="/web/20230314214432/https://www.nist.gov/director" class="usa-nav__link">Office of the Director</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/director/nist-organization-structure/budget-planning" class="usa-nav__link">Budget &amp; Planning</a> </li> </ul> </li> </ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list"> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/about-nist/work-nist" class="usa-nav__link">Work with NIST</a> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/history" class="usa-nav__link">History</a> <ul class="usa-nav__submenu-list"> <li> <a href="https://web.archive.org/web/20230314214432/http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/nist-museum" class="usa-nav__link">NIST Museum</a> </li> <li> <a href="/web/20230314214432/https://www.nist.gov/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a> </li> </ul> </li> <li class="usa-nav__submenu-item"> <a href="/web/20230314214432/https://www.nist.gov/education" class="usa-nav__link">Educational Resources</a> </li> </ul> </div> </div> </div> </li> </ul> </div> </nav> </header> <!-- nist-index-ignore-end --> </div> <div class="grid-container"> <div data-drupal-messages-fallback class="hidden"></div> </div> <div id="block-nist-www-content" class="nist-block"> <section class="nist-page__content usa-section clearfix"> <a id="main-content" tabindex="-1"></a> <div class="nist-section-header nist-section-header--menu"> <div class="nist-section-header__main grid-container"> <div class="grid-row"> <div class="nist-section-header__title tablet-lg:grid-col-4"> <h1 class="nist-page__title">Standard Reference Materials</h1> </div> <div class="nist-section-header__desc tablet-lg:grid-col-8"> <div class="text-with-summary"> <p>NIST supports accurate and compatible measurements by certifying and providing over 1200 Standard Reference Materials庐 with well-characterized composition or properties, or both.</p> </div> </div> </div> </div> </div> <div class="grid-container margin-top-4"> <div class="grid-row grid-gap-6"> <aside class="nist-page__region nist-page__region--sidebar-first tablet-lg:grid-col-4 desktop-lg:grid-col-3"> <div> <!-- nist-index-ignore-start --> <div data-elastic-exclude="" class="nist-block"> <nav> <ul class="usa-sidenav usa-accordion "> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/about-nist-srms" data-drupal-link-system-path="">About NIST SRMs</a> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing" data-drupal-link-system-path="">Ordering Policies and Pricing</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-standard-reference-material-2"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-standard-reference-material-2" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/sales-and-customer-service" data-drupal-link-system-path="">Sales and Customer Service</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/terms-and-conditions" data-drupal-link-system-path="">Terms and Conditions</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/pricing-policy" data-drupal-link-system-path="">Pricing Policy</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/document/prepaymentpolicyonnistsrmorders5292018pdf" data-drupal-link-system-path="">Payment Policy</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/ordering-policies" data-drupal-link-system-path="">Ordering Policies</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/required-ordering-information" data-drupal-link-system-path="">Required Ordering Information</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/order-discrepancies-and-returned-goods" data-drupal-link-system-path="">Order Discrepancies and Returned Goods</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/ordering-policies-and-pricing/shipping-information" data-drupal-link-system-path="">Shipping Information</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/srm-licensed-distributors" data-drupal-link-system-path="">Licensed Distributors</a> </li> <li class="usa-sidenav__item usa-sidenav__item--parent"> <a href="/web/20230314214432/https://www.nist.gov/srm/registration-and-surveys" data-drupal-link-system-path="">Registration and Surveys</a> <button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-standard-reference-material-4"><span class="usa-sr-only">Expand or Collapse</span></button> <ul id="menu-standard-reference-material-4" class="usa-sidenav__sublist usa-accordion"> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/srm_reg" data-drupal-link-system-path="">Register Your SRM</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/nistsrm_product" data-drupal-link-system-path="">Product Survey</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/nistsrm_survey" data-drupal-link-system-path="">Customer Service Survey</a> </li> </ul> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/using-online-catalog" data-drupal-link-system-path="">Using the Online Catalog</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/srm/srm-frequently-asked-questions" data-drupal-link-system-path="">SRM Frequently Asked Questions</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/srm-exhibits" data-drupal-link-system-path="">SRM Exhibits</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/srm-definitions" data-drupal-link-system-path="">SRM Definitions</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/ccrz__CCPage?pageKey=SRMCategory&amp;cclcl=en_US%29" data-drupal-link-system-path="">Tables of SRM Categories</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/how-cite-nist-srm" data-drupal-link-system-path="">How to Cite a NIST SRM</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/document/measurement-services-policy-letter" data-drupal-link-system-path="">Measurement Services Policy Letter</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/calibrations/traceability" data-drupal-link-system-path="">NIST Policy on Metrological Traceability</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/publications/search?k=&amp;t=&amp;a=&amp;ps=8681&amp;ta%5B0%5D=249386&amp;n=&amp;d%5Bmin%5D=&amp;d%5Bmax%5D=" data-drupal-link-system-path="">Publications (SP260s)</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/ccrz__CCPage?pageKey=SRMArchive&amp;cclcl=en_US" data-drupal-link-system-path="">Archived SRM/RM Certificates/Reports of Investigation</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/srm/new-srmsrms" data-drupal-link-system-path="">New SRMs/RMs</a> </li> <li class="usa-sidenav__item"> <a href="/web/20230314214432/https://www.nist.gov/sri" data-drupal-link-system-path="">Standard Reference Instruments</a> </li> <li class="usa-sidenav__item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/nist-quality-system" title="NIST Quality System" data-drupal-link-system-path="">NIST Quality System</a> </li> </ul> </nav> </div> <!-- nist-index-ignore-end --> </div> </aside> <div class="nist-page__region nist-page__region--content tablet-lg:grid-col-8 desktop-lg:grid-col-9"> <div class="nist-block"> <div class="paragraph paragraph--type--hero paragraph--view-mode--default"> <div class="nist-hero grid-row grid-gap-2"> <div class="nist-hero__item tablet:grid-col-4 "> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/"> <picture> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.webp?itok=oE5eTqtz 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.webp?itok=Fegrbo7p 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.webp?itok=f8u7Zq-x 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.webp?itok=oE5eTqtz 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.jpg?itok=oE5eTqtz 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.jpg?itok=Fegrbo7p 2x" media="(min-width: 480px)" type="image/jpeg" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.jpg?itok=f8u7Zq-x 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.jpg?itok=oE5eTqtz 2x" media="(min-width: 0px)" type="image/jpeg" width="300" height="180"/> <img loading="eager" src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/01/24/03ts001_peanutbsrm_cs-cropped.jpg?itok=oE5eTqtz" width="600" height="360" alt="Peanut butter standard reference material." title="Peanut butter" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/"> <div class="text">Order SRMs Online</div> </a> </div> </div> </div> <div class="nist-hero__item tablet:grid-col-4 nist-hero__item--overlay"> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="/web/20230314214432/https://www.nist.gov/document/2023-srm-catalog"> <picture> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.webp?itok=oJThjSaX 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/08/04/comment.webp?itok=Er5WkoDq 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/08/04/comment.webp?itok=QtcaDabv 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.webp?itok=oJThjSaX 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/08/04/comment.jpg?itok=Er5WkoDq 2x" media="(min-width: 480px)" type="image/jpeg" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/08/04/comment.jpg?itok=QtcaDabv 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX 2x" media="(min-width: 0px)" type="image/jpeg" width="300" height="180"/> <img loading="eager" src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX" width="600" height="360" alt="comment" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="/web/20230314214432/https://www.nist.gov/document/2023-srm-catalog"> <div class="text">Download the SRM Catalog 2023 Edition!</div> </a> </div> </div> </div> <div class="nist-hero__item tablet:grid-col-4 nist-hero__item--overlay"> <div class="nist-hero__item-inner"> <div class="nist-hero__image"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/"> <picture> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.webp?itok=oJThjSaX 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/08/04/comment.webp?itok=Er5WkoDq 2x" media="(min-width: 480px)" type="image/webp" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/08/04/comment.webp?itok=QtcaDabv 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.webp?itok=oJThjSaX 2x" media="(min-width: 0px)" type="image/webp" width="300" height="180"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/1200w_x_720h/public/images/2020/08/04/comment.jpg?itok=Er5WkoDq 2x" media="(min-width: 480px)" type="image/jpeg" width="600" height="360"/> <source srcset="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/300w_x_180h/public/images/2020/08/04/comment.jpg?itok=QtcaDabv 1x, /web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX 2x" media="(min-width: 0px)" type="image/jpeg" width="300" height="180"/> <img loading="eager" src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/600w_x_360h/public/images/2020/08/04/comment.jpg?itok=oJThjSaX" width="600" height="360" alt="comment" typeof="foaf:Image"/> </picture> </a> </div> <div class="nist-hero__caption"> <a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/"> <div class="text">Find Current SRM/RM Certificates, Reports of Investigation and Safety Data Sheets using the NIST Store鈥檚 Product Search Box</div> </a> </div> </div> </div> </div> </div> <div class="nist-content-row nist-content-row--width-normal paragraph paragraph--type--text paragraph--view-mode--default"> <div class="nist-block text-long"><div class="nist-callout"> <h3 class="critical text-align-center"><strong>SRMs are available for order at the NIST store,聽<a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/">https://shop.nist.gov</a>聽<br> Please update your bookmarks with our new web address.<br><span><span>Find Current SRM/RM Certificates, Reports of Investigation, and Safety Data Sheets using the NIST Store鈥檚 Product Search Box.</span></span></strong></h3> </div> <p class="critical"><span><span>Due to world events, all shipping to Russia, Belarus, and Ukraine has ceased. 聽As a result, the Office of Reference Materials will not be accepting or processing orders to these countries for the foreseeable future.</span></span>聽</p></div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">News and Updates</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-80c711d287bec8248bbfaa54379bc55ec16f0d8b7d7c160542e75c7d84df69bb"> <div> <article role="article" about="/news-events/news/2023/02/crystalline-srm-analysis-glucose-clinical-samples" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/02/crystalline-srm-analysis-glucose-clinical-samples" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/02/28/917d.jpg?itok=aVNYS0J_" width="100" height="56" alt="SRM 917d " loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/02/crystalline-srm-analysis-glucose-clinical-samples"><span property="schema:name">A Crystalline SRM for the Analysis of Glucose in Clinical Samples</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-02-28T12:00:00Z">February 28, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">This Standard Reference Material (SRM) is intended primarily for use in calibrating measuring systems employed for the analysis of glucose in clinical samples</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/measuring-herbicide-residue-oat-based-food-products" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/measuring-herbicide-residue-oat-based-food-products" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/30/8238_8239.jpg?itok=gXCJRkLM" width="75" height="100" alt="Glyphosate in Oat Flour" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/measuring-herbicide-residue-oat-based-food-products"><span property="schema:name">Measuring Herbicide Residue in Oat-Based Food Products</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-30T12:00:00Z">January 30, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">The Environmental Protection Agency (EPA) establishes tolerances for pesticide and herbicide residues in food that are still considered safe for consumption</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/assessing-fineness-construction-materials" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/assessing-fineness-construction-materials" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/20/114r.jpg?itok=NYdMHnXo" width="100" height="56" alt="SRM 114r Portland Cement Fineness" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/assessing-fineness-construction-materials"><span property="schema:name">Assessing the Fineness of Construction Materials</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-20T12:00:00Z">January 20, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">Portland cement powder is characterized by particle size for use in calibrating instruments, measuring fineness characteristics of portland cement, and other</div> </div> </div> </article> </div> <div> <article role="article" about="/news-events/news/2023/01/srm-3461-accurate-and-precise-force-calibration-artifact" typeof="schema:Article" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/srm-3461-accurate-and-precise-force-calibration-artifact" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2023/01/17/SRM%203461.jpg?itok=ZYXVDc-F" width="68" height="100" alt="SRM 3461" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/news-events/news/2023/01/srm-3461-accurate-and-precise-force-calibration-artifact"><span property="schema:name">SRM 3461: An Accurate and Precise Force Calibration Artifact</span> </a></h3> <div class="nist-teaser__date"> <div class="daterange"><time datetime="2023-01-18T12:00:00Z">January 18, 2023</time> </div> </div> </header> <div class="nist-teaser__content"> <div property="schema:text" class="text-with-summary">Atomic force microscopy (AFM) is a popular technique for interrogating surfaces on the micro and nano scales. The most common use for AFM is imaging; however</div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230314214432/https://www.nist.gov/news-events/news-updates/org/5921">View All News and Updates</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Projects and Programs</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-5f76a26f8b236f7f09d0223fe9fc4715e84b5fc039fbc22750dc195a54bccb2e"> <div> <article role="article" about="/programs-projects/nist-her2-genomic-dna-standard-reference-material-srmr-2373" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/programs-projects/nist-her2-genomic-dna-standard-reference-material-srmr-2373" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/2018/08/03/her2_srm.png?itok=I_fqNE6P" width="100" height="69" alt="HER2 SRM" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/programs-projects/nist-her2-genomic-dna-standard-reference-material-srmr-2373"><span>NIST HER2 Genomic DNA Standard Reference Material, SRM庐 2373</span> </a></h3> <div class="nist-teaser__type"> <div class="nist-badge display-inline-block margin-y-1 nist-badge--blue boolean">Ongoing</div> </div> </header> <div class="nist-teaser__content"> <div class="text-long"> NIST Standard Reference Material SRM庐 2373 was developed to improve the measurements of the HER2 gene amplification in DNA samples. SRM庐 2373 consists of </div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230314214432/https://www.nist.gov/laboratories/projects-programs/org/5921">View All Projects/Programs</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Awards</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-1a06702461fb3d1f2db24c2aca0b34e1e662fdae3a2cee7dbab42d2da9724501"> <div> <article role="article" about="/nist-awards/2019-eugene-casson-crittenden-award-james-fort" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/nist-awards/2019-eugene-casson-crittenden-award-james-fort" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/annual_award/2019crittenden-fortdsc85542000px_0.jpg?itok=uiXwETkj" width="80" height="100" alt="Fort" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/nist-awards/2019-eugene-casson-crittenden-award-james-fort"><span>2019 - Eugene Casson Crittenden Award---James Fort</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="string-long">For providing critical after-hours logistical handling of temperature-sensitive Standard Reference Materials (SRMs).</div> </div> </div> </article> </div> <div> <article role="article" about="/nist-awards/2016-judson-c-french-award-hua-jun-he-jamie-almeida-kenneth-cole-steven-choquette-steven" class="nist-teaser"> <div class="nist-teaser__image"> <div class="entity-reference"> <a href="/web/20230314214432/https://www.nist.gov/nist-awards/2016-judson-c-french-award-hua-jun-he-jamie-almeida-kenneth-cole-steven-choquette-steven" hreflang="en"><img src="/web/20230314214432im_/https://www.nist.gov/sites/default/files/styles/thumbnail/public/images/annual_award/french20-20he20lund20cole20almeida20choquette0_0.jpg?itok=4-zzCdZZ" width="100" height="71" alt="He, Lund, Cole, Almeida, Choquette" loading="lazy" typeof="foaf:Image"/> </a> </div> </div> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/nist-awards/2016-judson-c-french-award-hua-jun-he-jamie-almeida-kenneth-cole-steven-choquette-steven"><span>2016 - Judson C. French Award---Hua-jun He, Jamie Almeida, Kenneth Cole, Steven Choquette, Steven Lund</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="string-long">For development of the first-ever cancer-gene copy-number Standard Reference Material for diagnosing cancers: NIST SRM 2373.<br/> </div> </div> </div> </article> </div> <div> <article role="article" about="/nist-awards/2014-judson-c-french-award-alec-belsky-hong-sarah-fang-angela-y-lee-xin-jennifer-zeng" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/nist-awards/2014-judson-c-french-award-alec-belsky-hong-sarah-fang-angela-y-lee-xin-jennifer-zeng"><span>2014 - Judson C. French Award---Alec Belsky, Hong (Sarah) Fang, Angela Y. Lee, Xin (Jennifer) Zeng</span> </a></h3> </header> <div class="nist-teaser__content"> <div class="string-long">For creating the Calibration Support System for the NIST Calibration Services Program.</div> </div> </div> </article> </div> <footer> <div class="link-list"><a href="/web/20230314214432/https://www.nist.gov/awards/org/5921">View All Awards</a></div> </footer> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--dynamic-content-list-ou paragraph--view-mode--default"> <div class="nist-block "> <h2 class="nist-block__title"> <div class="string">Press Coverage</div> </h2> <div class="viewsreference"><div class="views-element-container"><div class="js-view-dom-id-6cac279e3837d3f3c3cf593dacd1f729112b079529912c602563c5f5adfbef64"> <div> <article role="article" about="/press-coverage/world-depends-strange-collection-items-theyre-not-cheap" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/press-coverage/world-depends-strange-collection-items-theyre-not-cheap"><span>The World Depends on a Strange Collection of Items. They&#039;re Not Cheap</span> </a></h3> <div class="nist-teaser__type"> <div class="string">Veritasium YouTube Channel</div> </div> <div class="nist-teaser__date"> <div class="datetime"><time datetime="2022-11-19T12:00:00Z">November 19, 2022</time> </div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">Steven Choquette, Benjamin Place, and Johanna Camara talk about the world of Standard Reference Materials.</div> </div> </div> </article> </div> <div> <article role="article" about="/press-coverage/keeping-americas-standards-job-nist-0" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/press-coverage/keeping-americas-standards-job-nist-0"><span>Keeping up America鈥檚 standards is the job of NIST</span> </a></h3> <div class="nist-teaser__type"> <div class="string">The Economist</div> </div> <div class="nist-teaser__date"> <div class="datetime"><time datetime="2022-08-17T12:00:00Z">August 17, 2022</time> </div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">Melissa Phillips and NIST collaborators explain why NIST reference materials are so important to industry, monitoring environmental and human health, and much</div> </div> </div> </article> </div> <div> <article role="article" about="/press-coverage/made-measure-why-we-cant-stop-quantifying-our-lives" class="nist-teaser"> <div class="nist-teaser__content-wrapper"> <header> <h3 class="nist-teaser__title"><a href="/web/20230314214432/https://www.nist.gov/press-coverage/made-measure-why-we-cant-stop-quantifying-our-lives"><span>Made to measure: why we can鈥檛 stop quantifying our lives</span> </a></h3> <div class="nist-teaser__type"> <div class="string">The Guardian</div> </div> <div class="nist-teaser__date"> <div class="datetime"><time datetime="2022-05-26T12:00:00Z">May 26, 2022</time> </div> </div> </header> <div class="nist-teaser__content"> <div class="text-with-summary">Dr. Steven Choquette, Director of the NIST Office of Reference Materials, is quoted in this article about metrology.</div> </div> </div> </article> </div> </div> </div> </div> </div> </div> <div class="paragraph paragraph--type--content-list paragraph--view-mode--default"> <div class="nist-block "> <div class="link-list"> </div> </div> </div> </div> </div> </div> </div> <div class="clearfix"> <div class="nist-resource-block "> <div class="nist-resource-block__title-bar"> <div class="nist-resource-block__title"> <div class="nist-resource-block__icon"> <img aria-hidden="true" role="img" alt="decorative icon" src="/web/20230314214432im_/https://www.nist.gov/themes/custom/nist_www/img/resource-icons/link-icon-2x.png"/> </div> <h2> <div class="string">Popular Links</div> </h2> </div> </div> <div class="nist-resource-block__content"> <div class="nist-block"> <div class="text-long"><div class="grid-row grid-gap"> <div class="grid-col"> <h2>Additional SRM Information</h2> <p><a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/srm_reg">Please Register Your SRM Online</a><br><a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/nistsrm_product">Rate our Products</a><br><a href="https://web.archive.org/web/20230314214432/https://www.surveymonkey.com/r/nistsrm_survey">Customer Service Survey</a><br><a href="https://web.archive.org/web/20230314214432/https://www-s.nist.gov/m-srmors/">SRM MOBILE - Access our website on your mobile devices!</a><br><a data-entity-substitution="canonical" data-entity-type="media" data-entity-uuid="780de870-6165-48e9-95b0-29cdef6f9489" href="/web/20230314214432/https://www.nist.gov/document/2023-srm-catalog" title="2023 SRM Catalog" class="media-link-ga " data-file-url="https://www.nist.gov/system/files/documents/2023/02/13/2023%20SRM%20Catalog_FINAL_2.pdf">NIST Standard Reference Materials 2023 Catalog</a> For the most up-to-date information, please consult our website at <span><span><a href="https://web.archive.org/web/20230314214432/https://shop.nist.gov/">https://shop.nist.gov/</a></span></span></p> </div> <div class="grid-col last"> <h2>NIST Related Links</h2> <p><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/srd">NIST Scientific and Technical Databases</a><br><a href="https://web.archive.org/web/20230314214432/http://srdata.nist.gov/gateway/">NIST Data Gateway</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/calibrations">Calibrations</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/nist-quality-system">NIST Quality System</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/pml/owm">Weights and Measures</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/nvlap">Laboratory Accreditation</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/standardsgov">Documentary Standards Coordination</a><br><a href="https://web.archive.org/web/20230314214432/https://inet.nist.gov/mml/orm/srm">SRM Site for NIST Staff</a><br><a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/calibrations/traceability">NIST Traceability Policy and Supplementary Materials</a></p> </div> </div></div> </div> </div> </div> </div> <div class="grid-container"> <div class="nist-page__region nist-page__region--content-bottom"> <div class="nist-block nist-block--contact"> <h2 class="nist-block__title">Contacts</h2> <div class="nist-contact"> <h3 class="nist-contact__heading">General Inquiries about NIST SRMs</h3> <ul class="nist-contact__items"> <li class="nist-contact__item"> <div class="nist-contact__name"> Sales and Customer Service </div> <div> <a href="https://web.archive.org/web/20230314214432/mailto:srminfo@nist.gov">srminfo@nist.gov</a> </div> <div> (301) 975-2200 </div> <div> 100 Bureau Drive <br> Stop 2300 <br> Gaithersburg, MD 20899 </div> </li> <li class="nist-contact__item"> <div class="nist-contact__name"> Certificate Inquiries: </div> <div> <a href="https://web.archive.org/web/20230314214432/mailto:srmdocuments@nist.gov">srmdocuments@nist.gov</a> </div> <div> </div> </li> <li class="nist-contact__item"> <div class="nist-contact__name"> Safety Data Sheets Inquiries: </div> <div> <a href="https://web.archive.org/web/20230314214432/mailto:srmmsds@nist.gov">srmmsds@nist.gov</a> </div> <div> </div> </li> <li class="nist-contact__item"> <div class="nist-contact__name"> Technical Inquiries about NIST SRMs: </div> <div> <a href="https://web.archive.org/web/20230314214432/mailto:srms@nist.gov">srms@nist.gov</a> </div> <div> </div> </li> </ul> </div> <div class="nist-contact"> <ul class="nist-contact__items"> </ul> </div> </div> </div> </div> </section> </div> <div data-elastic-exclude> <!-- nist-index-ignore-start --> <footer class="nist-footer padding-bottom-4"> <div class="grid-container nist-footer__info"> <div class="grid-row"> <div class="tablet:grid-col-6"> <div class="nist-footer__logo"> <a href="/web/20230314214432/https://www.nist.gov/" title="National Institute of Standards and Technology" rel="home"> <img class="nist-footer__logo-img" src="/web/20230314214432im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px"/> </a> </div> <div class="nist-footer__contact"> <h3 class="nist-footer__contact-heading">HEADQUARTERS</h3> <address> 100 Bureau Drive<br> Gaithersburg, MD 20899<br> <a href="https://web.archive.org/web/20230314214432/tel:301-975-2000">301-975-2000</a> </address> <p> <a href="https://web.archive.org/web/20230314214432/mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/visit">Our Other Offices</a> </p> </div> </div> <div class="tablet:grid-col-6"> <div class="nist-footer__social-links"> <a class="nist-social nist-social--twitter-white" href="https://web.archive.org/web/20230314214432/https://twitter.com/NIST"> <span>Twitter</span> </a> <a class="nist-social nist-social--facebook-white" href="https://web.archive.org/web/20230314214432/https://www.facebook.com/NIST"> <span>Facebook</span> </a> <a class="nist-social nist-social--linkedin-white" href="https://web.archive.org/web/20230314214432/https://www.linkedin.com/company/nist"> <span>LinkedIn</span> </a> <a class="nist-social nist-social--instagram-white" href="https://web.archive.org/web/20230314214432/https://www.instagram.com/nist/"> <span>Instagram</span> </a> <a class="nist-social nist-social--youtube-white" href="https://web.archive.org/web/20230314214432/https://www.youtube.com/NIST"> <span>YouTube</span> </a> <a class="nist-social nist-social--giphy-white" href="https://web.archive.org/web/20230314214432/https://giphy.com/nist"> <span>Giphy</span> </a> <a class="nist-social nist-social--rss-white" href="https://web.archive.org/web/20230314214432/https://www.nist.gov/news-events/nist-rss-feeds"> <span>RSS Feed</span> </a> <a class="nist-social nist-social--envelope-white" href="https://web.archive.org/web/20230314214432/https://public.govdelivery.com/accounts/USNIST/subscriber/new"> <span>Mailing List</span> </a> </div> <div class="nist-footer__feedback"> How are we doing? <a class="usa-button" rel="nofollow" href="/web/20230314214432/https://www.nist.gov/form/nist-gov-feedback?destination=/srm" title="Provide feedback">Feedback</a> </div> </div> </div> </div> <div class="grid-container"> <div class="nist-footer__nav" role="navigation"> <ul> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/privacy-policy">Site Privacy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/oism/accessibility">Accessibility</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/privacy">Privacy Program</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/oism/copyrights">Copyrights</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.commerce.gov/vulnerability-disclosure-policy">Vulnerability Disclosure</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/no-fear-act-policy">No Fear Act Policy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/office-director/freedom-information-act">FOIA</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/environmental-policy-statement">Environmental Policy</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/summary-report-scientific-integrity">Scientific Integrity</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.nist.gov/nist-information-quality-standards">Information Quality Standards</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://www.commerce.gov/">Commerce.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/http://www.science.gov/">Science.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/http://www.usa.gov/">USA.gov</a> </li> <li class="nist-footer__menu-item"> <a href="https://web.archive.org/web/20230314214432/https://vote.gov/">Vote.gov</a> </li> </ul> </div> </div> </footer> <!-- nist-index-ignore-end --> </div> </div> <script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","scriptPath":null,"pathPrefix":"","currentPath":"node\/419246","currentPathIsAdmin":false,"isFront":false,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"back_to_top":{"back_to_top_button_trigger":100,"back_to_top_prevent_on_mobile":false,"back_to_top_prevent_in_admin":true,"back_to_top_button_type":"image","back_to_top_button_text":"Back to top"},"google_analytics":{"account":"UA-66610693-3","trackOutbound":true,"trackMailto":true,"trackTel":true,"trackDownload":true,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|bsh|c|csv|doc(x|m)?|dot(x|m)?|dw(fx|g|gd)|dxf|eps|epub|exe|f(90)|flv|gif|gz|gzip|hqx|jar|jpe?g|js|m1v|mp(2|3|4|e?g)|mobi|mov(ie)?|msi|msp|pdf|phps|pl|png|ppt(x|m)?|pot(x|m)?|pps(x|m)?|ppam|sld(x|m)?|thmx|qtm?|ra(m|r)?|rfa|rtf|rvt|sch|sea|sit|swf|tar|tgz|tif|txt|txz|wav|wma|wmv|wpd|wrl|xls(x|m|b)?|xlt(x|m)|xlam|xml|xsd|z|zip","trackDomainMode":1},"nist_search":{"clickTracking":"search-report-click","isDebug":false,"clickTrackEnabled":true,"message":"NIST Search in debug mode. Check the browsers network inspector for Click Track reporting results..."},"data":{"extlink":{"extTarget":false,"extTargetNoOverride":false,"extNofollow":false,"extNoreferrer":false,"extFollowNoOverride":false,"extClass":"ext","extLabel":"(link is external)","extImgClass":false,"extSubdomains":true,"extExclude":"\\.gov\\\/|\\.mil\\\/|\\manufacturingusa\\.com\\\/","extInclude":"","extCssExclude":"","extCssExplicit":"","extAlert":true,"extAlertText":"Thank you for visiting NIST. We hope your visit was informative. We have provided a link to this site because it has information that may be of interest to our users. NIST does not necessarily endorse the views expressed or the facts presented on this site. Further, NIST does not endorse any commercial products that may be advertised or available on this site. Click OK to be directed to your link.","mailtoClass":"0","mailtoLabel":"(link sends email)","extUseFontAwesome":false,"extIconPlacement":"append","extFaLinkClasses":"fa fa-external-link","extFaMailtoClasses":"fa fa-envelope-o","whitelistedDomains":[]}},"user":{"uid":0,"permissionsHash":"582eea317b4636ab5a0dffc8c6a006df3d6901ea5610498a0bbefc925ea1da0f"}}</script> <script src="/web/20230314214432js_/https://www.nist.gov/sites/default/files/js/js_AOg417qepduGFvXDI_SP863Nh3qVCuiSeO8_GAxUYnk.js"></script> <script src="https://web.archive.org/web/20230314214432js_/https://siteimproveanalytics.com/js/siteanalyze_6017546.js" async></script> <script src="/web/20230314214432js_/https://www.nist.gov/sites/default/files/js/js__m8lPoob6WYP5ISBblOsGOTOBGL48ZeEwQyTPAl7RqA.js"></script> <script type="text/javascript">window.NREUM||(NREUM={});NREUM.info={"beacon":"gov-bam.nr-data.net","licenseKey":"37b7ccb661","applicationID":"1089704227","transactionName":"YFxUN0sADEdYVkBaClkWdwBNCA1aFnFGRhVWVWoNVgUHaHpaWkcXWFVaBks9LFtdUGJaAEB6WQ1NEw1YVVBGHltBUFMU","queueTime":0,"applicationTime":3387,"atts":"TBtXQQMaH0k=","errorBeacon":"gov-bam.nr-data.net","agent":""}</script></body> </html> <!-- FILE ARCHIVED ON 21:44:32 Mar 14, 2023 AND RETRIEVED FROM THE INTERNET ARCHIVE ON 02:38:17 Dec 04, 2024. JAVASCRIPT APPENDED BY WAYBACK MACHINE, COPYRIGHT INTERNET ARCHIVE. ALL OTHER CONTENT MAY ALSO BE PROTECTED BY COPYRIGHT (17 U.S.C. SECTION 108(a)(3)). --> <!-- playback timings (ms): captures_list: 0.496 exclusion.robots: 0.035 exclusion.robots.policy: 0.025 esindex: 0.009 cdx.remote: 18.44 LoadShardBlock: 161.787 (3) PetaboxLoader3.datanode: 82.523 (4) PetaboxLoader3.resolve: 125.325 (3) load_resource: 94.705 -->

Pages: 1 2 3 4 5 6 7 8 9 10