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id="sidebar"> <div class="sidebar-nav"> <div class="navbar navbar-default" role="navigation"> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".sidebar-navbar-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <span class="visible-xs navbar-brand">Publication 52 - Hazardous, Restricted, and Perishable Mail</span> </div> <div class="navbar-collapse collapse sidebar-navbar-collapse"> <ul class="nav navbar-nav"> <li><h1><a href="/text/pub52/welcome.htm">Publication 52 - Hazardous, Restricted, and Perishable Mail</a></h1></li><li ><a href="/text/pub52/pub52un.htm" target="">Summary of Changes</a></li><li ><a href="/text/pub52/pub52tl.htm" target="">Transmittal Letter</a></li><li class="flyout"><a href="/text/pub52/pub52c1_001.htm" >1 Introduction <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c1_001.htm#ep392279" >11 Purpose <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c1_001.htm#ep392281" target="">111 General</a></li><li ><a href="/text/pub52/pub52c1_002.htm" target="">112 Use</a></li><li ><a href="/text/pub52/pub52c1_003.htm" target="">113 Other Reference Sources</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c1_004.htm" >12 Scope <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c1_004.htm#ep392335" target="">121 General</a></li><li ><a href="/text/pub52/pub52c1_005.htm" target="">122 Hazardous, Restricted, and Perishable</a></li><li ><a href="/text/pub52/pub52c1_006.htm" target="">123 Mailability Premise</a></li></ul></li><li ><a href="/text/pub52/pub52c1_007.htm" target="">13 Additional Information</a></li><li ><a href="/text/pub52/pub52c1_008.htm" target="">14 Safety</a></li><li ><a href="/text/pub52/pub52c1_009.htm" target="">15 Protecting Personnel</a></li><li ><a href="/text/pub52/pub52c1_010.htm" target="">16 Military Postal System</a></li><li ><a href="/text/pub52/pub52c1_011.htm" target="">17 Statutory System</a></li><li class="flyout"><a href="/text/pub52/pub52c1_012.htm" >18 Trademarks of the USPS <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c1_012.htm#ep396940" target="">181 Use of USPS Trademarks</a></li><li ><a href="/text/pub52/pub52c1_013.htm" target="">182 Common Law Marks or USPS Marks with Pending Trademark Applications</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c2_001.htm" >2 General Guidelines <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c2_001.htm#ep772764" >21 Mailability <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c2_001.htm#ep772768" target="">211 General</a></li><li ><a href="/text/pub52/pub52c2_002.htm" target="">212 Mailer Responsibility</a></li><li ><a href="/text/pub52/pub52c2_003.htm" target="">213 Authority</a></li><li ><a href="/text/pub52/pub52c2_004.htm" target="">214 Appeals</a></li><li ><a href="/text/pub52/pub52c2_005.htm" target="">215 Requests for Rulings</a></li><li ><a href="/text/pub52/pub52c2_006.htm" target="">216 Nonmailable Matter Found in the Mail</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c2_007.htm" >22 Marking Requirements <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c2_007.htm#ep772884" target="">221 General</a></li><li ><a href="/text/pub52/pub52c2_008.htm" target="">222 Matter Excepted From Markings</a></li><li ><a href="/text/pub52/pub52c2_009.htm" target="">223 Hazardous Materials Warning Labels and Markings</a></li><li ><a href="/text/pub52/pub52c2_010.htm" target="">224 Tag 44 for Hazardous Materials</a></li><li ><a href="/text/pub52/pub52c2_011.htm" target="">225 Other Postal Service Labels and Tags</a></li><li ><a href="/text/pub52/pub52c2_012.htm" target="">226 Package Orientation Markings</a></li><li ><a href="/text/pub52/pub52c2_013.htm" target="">227 Old Markings</a></li><li ><a href="/text/pub52/pub52c2_014.htm" target="">228 Shipping Papers</a></li></ul></li><li ><a href="/text/pub52/pub52c2_015.htm" target="">23 Handling Hazardous Materials</a></li><li class="flyout"><a href="/text/pub52/pub52c2_016.htm" >24 Emergency Procedures <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c2_016.htm#ep772998" target="">241 General Requirements</a></li><li ><a href="/text/pub52/pub52c2_017.htm" target="">242 Hazard Duration</a></li><li ><a href="/text/pub52/pub52c2_018.htm" target="">243 Precautions</a></li><li ><a href="/text/pub52/pub52c2_019.htm" target="">244 Procedures</a></li><li ><a href="/text/pub52/pub52c2_020.htm" target="">245 Hazardous Chemical Emergencies</a></li><li ><a href="/text/pub52/pub52c2_021.htm" target="">246 Emergency Telephone Numbers</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c2_022.htm" >25 Basic Guidelines for Acceptance and Dispatch <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c2_022.htm#ep773106" target="">251 Guidelines for Acceptance Personnel</a></li><li ><a href="/text/pub52/pub52c2_023.htm" target="">252 Guidelines for Dispatch Personnel</a></li><li ><a href="/text/pub52/pub52c2_024.htm" target="">253 Guidelines for Delivery and Collection Personnel</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c3_001.htm" >3 Hazardous Materials <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c3_001.htm#ep940337" target="">31 Definition</a></li><li class="flyout"><a href="/text/pub52/pub52c3_002.htm" >32 General <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c3_002.htm#ep898363" target="">321 U.S. Department of Transportation</a></li><li ><a href="/text/pub52/pub52c3_003.htm" target="">322 Postal Service</a></li><li ><a href="/text/pub52/pub52c3_004.htm" target="">323 Mailer Responsibility</a></li><li ><a href="/text/pub52/pub52c3_005.htm" target="">324 Mailability Rulings</a></li><li ><a href="/text/pub52/pub52c3_006.htm" target="">325 DOT Hazardous Materials Warning Labels</a></li><li ><a href="/text/pub52/pub52c3_007.htm" target="">326 Shipping Papers</a></li><li ><a href="/text/pub52/pub52c3_008.htm" target="">327 Transportation Requirements</a></li><li ><a href="/text/pub52/pub52c3_009.htm" target="">328 Postal Service Hazardous Materials Table</a></li><li ><a href="/text/pub52/pub52c3_010.htm" target="">329 Presentation of Hazardous-Materials Mailings</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c3_011.htm" >33 Hazard Classes <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c3_011.htm#ep898504" target="">331 Nine Classes</a></li><li ><a href="/text/pub52/pub52c3_012.htm" target="">332 Limited Quantity</a></li><li ><a href="/text/pub52/pub52c3_013.htm" target="">333 Consumer Commodity</a></li><li ><a href="/text/pub52/pub52c3_014.htm" target="">334 USPS Limited Quantity Air Materials</a></li><li ><a href="/text/pub52/pub52c3_015.htm" target="">335 ID8000 Materials</a></li><li ><a href="/text/pub52/pub52c3_016.htm" target="">336 USPS Limited Quantity Surface Materials</a></li><li ><a href="/text/pub52/pub52c3_017.htm" target="">337 Excepted Quantity</a></li><li ><a href="/text/pub52/pub52c3_018.htm" target="">338 Small Quantity</a></li><li ><a href="/text/pub52/pub52c3_019.htm" target="">339 Hazardous Materials</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c3_020.htm" >34 Mailability by Hazard Class <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c3_020.htm#ep898624" target="">341 Explosives (Hazard Class 1)</a></li><li ><a href="/text/pub52/pub52c3_021.htm" target="">342 Gases (Hazard Class 2)</a></li><li ><a href="/text/pub52/pub52c3_022.htm" target="">343 Flammable and Combustible Liquids (Hazard Class 3)</a></li><li ><a href="/text/pub52/pub52c3_023.htm" target="">344 Flammable Solids (Hazard Class 4)</a></li><li ><a href="/text/pub52/pub52c3_024.htm" target="">345 Oxidizing Substances, Organic Peroxides (Hazard Class 5)</a></li><li ><a href="/text/pub52/pub52c3_025.htm" target="">346 Toxic Substances and Infectious Substances (Hazard Class 6)</a></li><li ><a href="/text/pub52/pub52c3_026.htm" target="">347 Radioactive Materials (Hazard Class 7)</a></li><li ><a href="/text/pub52/pub52c3_027.htm" target="">348 Corrosives (Hazard Class 8)</a></li><li ><a href="/text/pub52/pub52c3_028.htm" target="">349 Miscellaneous Hazardous Materials (Hazard Class 9)</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_001.htm" >4 Restricted Matter <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c4_001.htm#ep306072" >41 General <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_001.htm#ep290037" target="">411 Definition</a></li><li ><a href="/text/pub52/pub52c4_002.htm" target="">412 Mailer Responsibility</a></li><li ><a href="/text/pub52/pub52c4_003.htm" target="">413 Rulings</a></li><li ><a href="/text/pub52/pub52c4_004.htm" target="">414 Nonmailable Matter Found in the Mails</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_005.htm" >42 Intoxicating Liquors <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_005.htm#ep290063" target="">421 Definition</a></li><li ><a href="/text/pub52/pub52c4_006.htm" target="">422 Mailability</a></li><li ><a href="/text/pub52/pub52c4_007.htm" target="">423 Packaging and Marking</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_008.htm" >43 Firearms <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_008.htm#ep290111" target="">431 Definitions</a></li><li ><a href="/text/pub52/pub52c4_009.htm" target="">432 Mailability</a></li><li ><a href="/text/pub52/pub52c4_010.htm" target="">433 Legal Opinions on Mailing Firearms</a></li><li ><a href="/text/pub52/pub52c4_011.htm" target="">434 Replica or Inert Explosive Devices</a></li><li ><a href="/text/pub52/pub52c4_012.htm" target="">435 Nonmailable Firearms Found in the Mails</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_013.htm" >44 Knives and Sharp Instruments <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_013.htm#ep290208" target="">441 Definitions</a></li><li ><a href="/text/pub52/pub52c4_014.htm" target="">442 Mailability</a></li><li ><a href="/text/pub52/pub52c4_015.htm" target="">443 Packaging and Marking</a></li><li ><a href="/text/pub52/pub52c4_016.htm" target="">444 Nonmailable Knives in the Mails</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_017.htm" >45 Other Restricted Materials <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_017.htm#ep346759" target="">451 Liquids, Powders, and Odor-Producing Materials</a></li><li ><a href="/text/pub52/pub52c4_018.htm" target="">452 Motor Vehicle Master Keys and Locksmithing Devices</a></li><li ><a href="/text/pub52/pub52c4_019.htm" target="">453 Controlled Substances and Drugs</a></li><li ><a href="/text/pub52/pub52c4_020.htm" target="">454 Unsolicited Promotional Samples</a></li><li ><a href="/text/pub52/pub52c4_021.htm" target="">455 Building Construction Material</a></li><li ><a href="/text/pub52/pub52c4_022.htm" target="">456 Lottery</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_023.htm" >46 Animal-Fighting Ventures <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_023.htm" target="">461 Definitions</a></li><li ><a href="/text/pub52/pub52c4_024.htm" target="">462 Mailability</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c4_025.htm" >47 Cigarettes and Smokeless Tobacco <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c4_025.htm" target="">471 Definitions</a></li><li ><a href="/text/pub52/pub52c4_026.htm" target="">472 Mailability</a></li><li ><a href="/text/pub52/pub52c4_027.htm" target="">473 Mailability Exceptions</a></li><li ><a href="/text/pub52/pub52c4_028.htm" target="">474 Additional Guidance</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c5_001.htm" >5 Perishable Matter <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c5_001.htm#ep183801" >51 Definition <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c5_001.htm#ep206478" target="">511 General Definitions</a></li><li ><a href="/text/pub52/pub52c5_002.htm" target="">512 Federal Statutes</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c5_003.htm" >52 Animals <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c5_003.htm#ep183811" target="">521 General Requirements</a></li><li ><a href="/text/pub52/pub52c5_004.htm" target="">522 Packaging and Markings</a></li><li ><a href="/text/pub52/pub52c5_005.htm" target="">523 Acceptance for Mailing</a></li><li ><a href="/text/pub52/pub52c5_006.htm" target="">524 Disposal</a></li><li ><a href="/text/pub52/pub52c5_007.htm" target="">525 Nonmailable Live Animals</a></li><li ><a href="/text/pub52/pub52c5_008.htm" target="">526 Mailable Live Animals</a></li></ul></li><li ><a href="/text/pub52/pub52c5_009.htm" target="">53 Fresh Foods and Other Perishables</a></li><li ><a href="/text/pub52/pub52c5_010.htm" target="">54 Eggs</a></li><li ><a href="/text/pub52/pub52c5_011.htm" target="">55 Meats and Meat Products</a></li><li class="flyout"><a href="/text/pub52/pub52c5_012.htm" >56 Plants <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c5_012.htm#ep184156" target="">561 General</a></li><li ><a href="/text/pub52/pub52c5_013.htm" target="">562 Quarantines</a></li><li ><a href="/text/pub52/pub52c5_014.htm" target="">563 Packaging and Marking</a></li><li ><a href="/text/pub52/pub52c5_015.htm" target="">564 Further Information</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c5_016.htm" >57 Nonmailable Plant Pests, Injurious Animals, and Illegally Taken Fish or Wildlife <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c5_016.htm#ep184203" target="">571 General</a></li><li ><a href="/text/pub52/pub52c5_017.htm" target="">572 Criminal Penalties</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c6_001.htm" >6 International Mail <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c6_001.htm#ep271738" >61 General <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c6_002.htm" target="">611 Refusal by Air Carrier</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c6_003.htm" >62 Hazardous Materials: International Mail <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c6_003.htm#ep254876" target="">621 General Requirements</a></li><li ><a href="/text/pub52/pub52c6_004.htm" target="">622 Mailable Hazardous Materials</a></li><li ><a href="/text/pub52/pub52c6_005.htm" target="">623 Nonmailable Hazardous Materials</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c6_006.htm" >63 Restricted Matter: International Mail <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c6_006.htm#ep255105" target="">631 APO/FPO/DPO Mail</a></li><li ><a href="/text/pub52/pub52c6_007.htm" target="">632 Firearms</a></li><li ><a href="/text/pub52/pub52c6_008.htm" target="">633 Inert Replica and Explosive Devices</a></li><li ><a href="/text/pub52/pub52c6_009.htm" target="">634 Knives and Sharp Instruments</a></li><li ><a href="/text/pub52/pub52c6_010.htm" target="">635 Drugs</a></li><li ><a href="/text/pub52/pub52c6_011.htm" target="">636 Controlled Substances</a></li><li ><a href="/text/pub52/pub52c6_012.htm" target="">637 Other Restricted Matter</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c6_013.htm" >64 Perishable Matter: International Mail <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c6_013.htm#ep255159" target="">641 APO/FPO/DPO Mail</a></li><li ><a href="/text/pub52/pub52c6_014.htm" target="">642 Animals</a></li><li ><a href="/text/pub52/pub52c6_015.htm" target="">643 Eggs</a></li><li ><a href="/text/pub52/pub52c6_016.htm" target="">644 Plants</a></li><li ><a href="/text/pub52/pub52c6_017.htm" target="">645 Fresh Foods and Other Perishables</a></li></ul></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c7_001.htm" >7 Air Transportation Requirements <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52c7_001.htm#ep760103" >71 General <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c7_002.htm" target="">711 Refusal by Air Carrier</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c7_003.htm" >72 Hazardous Materials: Air Transportation <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c7_003.htm#ep744832" target="">721 General Requirements</a></li><li ><a href="/text/pub52/pub52c7_004.htm" target="">722 Additional Requirements</a></li><li ><a href="/text/pub52/pub52c7_005.htm" target="">723 Hazardous Materials Warning Labels</a></li><li ><a href="/text/pub52/pub52c7_006.htm" target="">724 Consumer Commodity and Mailable Limited Quantity Materials</a></li><li ><a href="/text/pub52/pub52c7_007.htm" target="">725 Mailer Responsibility</a></li><li ><a href="/text/pub52/pub52c7_008.htm" target="">726 Postal Service Handling</a></li><li ><a href="/text/pub52/pub52c7_009.htm" target="">727 Refusal by Air Carrier</a></li><li ><a href="/text/pub52/pub52c7_010.htm" target="">728 Spills and Leaks</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c7_011.htm" >73 Restricted Matter: Air Transportation <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c7_012.htm" target="">731 Refusal by Air Carrier</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52c7_013.htm" >74 Perishable Matter: Air Transportation <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52c7_013.htm#ep745050" target="">741 General Requirements</a></li><li ><a href="/text/pub52/pub52c7_014.htm" target="">742 Live Animals</a></li><li ><a href="/text/pub52/pub52c7_015.htm" target="">743 Perishable Matter with Dry Ice</a></li></ul></li></ul></li><li ><a href="/text/pub52/pub52apxa.htm" target="">Appendix A</a></li><li ><a href="/text/pub52/pub52apxb.htm" target="">Appendix B</a></li><li class="flyout"><a href="/text/pub52/pub52apxc_001.htm" >Appendix C <b class="caret"></b></a><ul class="dropdown-menu"><li class="flyout"><a href="/text/pub52/pub52apxc_001.htm" >USPS Packaging Instruction 1-3 <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52apxc_002.htm#ep999526" target="">1A Toy Propellant Devices</a></li><li ><a href="/text/pub52/pub52apxc_003.htm#ep999567" target="">1B Safety Fuse</a></li><li ><a href="/text/pub52/pub52apxc_004.htm#ep999601" target="">2A Flammable Gases</a></li><li ><a href="/text/pub52/pub52apxc_005.htm#ep999646" target="">2B Nonflammable Gases</a></li><li ><a href="/text/pub52/pub52apxc_006.htm#ep999696" target="">2C Fire Extinguishers</a></li><li ><a href="/text/pub52/pub52apxc_007.htm#ep999734" target="">2D Foodstuffs and Soap Products</a></li><li ><a href="/text/pub52/pub52apxc_008.htm#ep999770" target="">2E Audible Fire Alarm Systems</a></li><li ><a href="/text/pub52/pub52apxc_009.htm#ep999807" target="">2F Biological Products or Medical Preparations</a></li><li ><a href="/text/pub52/pub52apxc_010.htm#ep999843" target="">3A Flammable Liquids</a></li><li ><a href="/text/pub52/pub52apxc_011.htm#ep999910" target="">3B Combustible Liquids</a></li><li ><a href="/text/pub52/pub52apxc_012.htm#ep999987" target="">3C Cigarette Lighters</a></li><li ><a href="/text/pub52/pub52apxc_013.htm#ep1002937" target="">3D Ethanol-based Flammable Liquids and Solids</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52apxc_001.htm" >USPS Packaging Instruction 4-6 <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52apxc_014.htm#ep1000015" target="">4A Flammable Solids</a></li><li ><a href="/text/pub52/pub52apxc_015.htm#ep1000053" target="">4B Safety Matches</a></li><li ><a href="/text/pub52/pub52apxc_016.htm#ep1000082" target="">5A Oxidizing Substances, Organic Peroxides</a></li><li ><a href="/text/pub52/pub52apxc_017.htm#ep1000127" target="">6A Toxic Substances</a></li><li ><a href="/text/pub52/pub52apxc_018.htm#ep1000165" target="">6B Toxic Substances With LD50 Oral Toxicity of 50 mg/kg or Less</a></li><li ><a href="/text/pub52/pub52apxc_019.htm#ep1000218" target="">6C Category B Infectious Substances</a></li><li ><a href="/text/pub52/pub52apxc_020.htm#ep1000286" target="">6D Sharps Waste and Other Regulated Medical Waste</a></li><li ><a href="/text/pub52/pub52apxc_021.htm#ep1000348" target="">6E Used Health Care Products</a></li><li ><a href="/text/pub52/pub52apxc_022.htm#ep1000377" target="">6F Forensic Material</a></li><li ><a href="/text/pub52/pub52apxc_023.htm#ep1000450" target="">6G Nonregulated Infectious Materials</a></li><li ><a href="/text/pub52/pub52apxc_024.htm#ep1000503" target="">6H Exempt Human or Animal Specimens</a></li></ul></li><li class="flyout"><a href="/text/pub52/pub52apxc_001.htm" >USPS Packaging Instruction 7-10 <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52apxc_025.htm#ep1000541" target="">7A Radioactive Materials</a></li><li ><a href="/text/pub52/pub52apxc_026.htm#ep1000659" target="">8A Corrosives</a></li><li ><a href="/text/pub52/pub52apxc_027.htm#ep1000734" target="">8B Nonspillable Wet Battery</a></li><li ><a href="/text/pub52/pub52apxc_028.htm#ep1000760" target="">8C Manufactured Devices that Contain Small Amounts of Mercury</a></li><li ><a href="/text/pub52/pub52apxc_029.htm#ep1000804" target="">9A Dry Ice (Carbon Dioxide Solid)</a></li><li ><a href="/text/pub52/pub52apxc_030.htm#ep1000830" target="">9B Magnetized Materials</a></li><li ><a href="/text/pub52/pub52apxc_031.htm#ep1000862" target="">9C Miscellaneous Hazardous Materials</a></li><li ><a href="/text/pub52/pub52apxc_032.htm#ep1000901" target="">9D Lithium Metal and Lithium-ion Cells and Batteries Domestic</a></li><li ><a href="/text/pub52/pub52apxc_033.htm#ep1001090" target="">9E Lithium Metal and Lithium-ion Cells and Batteries International and APO/FPO/DPO</a></li><li ><a href="/text/pub52/pub52apxc_034.htm#ep1001233" target="">10A Small Quantity Provision</a></li><li ><a href="/text/pub52/pub52apxc_035.htm#ep1001263" target="">10B - Excepted Quantity Provision</a></li><li ><a href="/text/pub52/pub52apxc_036.htm" target="">10C - Cremated Remains</a></li><li ><a href="/text/pub52/pub52apxc_037.htm" target="">10D - Adult Bird Boxes</a></li></ul></li></ul></li><li ><a href="/text/pub52/pub52apxd.htm" target="">Appendix D</a></li><li class="flyout"><a href="/text/pub52/pub52apxe_001.htm" >Appendix E <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52apxe_002.htm" target="">Postal Service Publications and Reference Materials</a></li><li ><a href="/text/pub52/pub52apxe_003.htm" target="">Other Publications</a></li></ul></li><li ><a href="/text/pub52/pub52apxf.htm" target="">Appendix F</a></li><li class="flyout"><a href="/text/pub52/pub52apxg_001.htm" >Appendix G <b class="caret"></b></a><ul class="dropdown-menu"><li ><a href="/text/pub52/pub52apxg_002.htm" target="">STCs Domestic Outbound (Required)</a></li><li ><a href="/text/pub52/pub52apxg_003.htm" target="">STCs Domestic Outbound (Optional)</a></li><li ><a href="/text/pub52/pub52apxg_004.htm" target="">STCs Domestic Returns (Required)</a></li><li ><a href="/text/pub52/pub52apxg_005.htm" target="">STCs Domestic Outbound (Optional)</a></li><li ><a href="/text/pub52/pub52apxg_006.htm" target="">ESCs Domestic (Optional)</a></li><li ><a href="/text/pub52/pub52apxg_007.htm" target="">ESCs Domestic and International, including APO/FPO/DPO (Required) </a></li><li ><a href="/text/pub52/pub52apxg_008.htm" target="">ESCs International and APO/FPO/DPO (Required)</a></li></ul></li><li ><a href="/text/pub52/index.htm" target="">Index</a></li> </ul> </div>  </div> </div> </div>  </div> <div id="subcontent" class="col-sm-8 col-md-9 col-p-12"> <div id="pe-content-document" class="postal-vendor"> <div id="wrapper">  <a name="PageTop"></a> <table border="0" cellpadding="0" cellspacing="0" id="MainBodySection"> <tr> <td valign="top" id="contentArea"> <div class="gutter"> <table cellspacing="0" cellpadding="0" border="0" width="100%"> <tr> <td width="100%"> <p class="breadcrumb" style="text-align: left;"> <a href="welcome.htm">Publication 52 - Hazardous, Restricted, and Perishable Mail</a> > <a href="pub52c4_001.htm#ep305415"> 4 Restricted Matter</a> > 45 Other Restricted Materials</p>   <table border="0" cellspacing="0" cellpadding="2" summary="Document navigation links" class="docNavLinks"> <tr> <td align="left" width="70" class="previous"> <a class="np" href="pub52c4_016.htm" title="Link to "444 Nonmailable Knives in the Mails"" accesskey="p"> <img src="images/previous.gif" width="63" height="17" alt="Link to "444 Nonmailable Knives in the Mails"" border="0" /> </a> </td> <td width="280" class="middle"> <a class="contents" href="pub52c4_toc.htm" title="Link to contents for "4 Restricted Matter"" accesskey="c"> <img src="images/contents.gif" width="63" height="17" alt="Link to contents for "4 Restricted Matter"" border="0" /> </a>      <a class="contents" href="" title="Link to Index" accesskey="i"><img src="images/index.gif" width="46" height="17" alt="Link to Index" border="0" /></a></td> <td width="70" class="next"> <a class="np" href="pub52c4_018.htm" title="Link to "452 Motor Vehicle Master Keys and Locksmithing Devices"" accesskey="n"> <img src="images/next.gif" width="46" height="17" alt="Link to "452 Motor Vehicle Master Keys and Locksmithing Devices"" border="0" /> </a> </td> </tr> </table>  <a name="content"></a> <div> <h2 class="H2 head2"> 45 <a name="ep346755">Other Restricted Materials</a></h2> <h3 class="H3 head3"> 451 <a name="ep346759">Liquids, Powders, and Odor-Producing Materials</a></h3> <h4 class="H4 head4"> 451.1 <a name="ep290266">Definitions</a></h4> <p class="P"><a name="ep290268">A</a><em class="italic"> liquid</em> is any substance that flows readily and assumes the form of the container, but retains an independent volume. For the purposes of mailability, a liquid may be a cream or paste or any other nonhazardous substance (except a gas) that may liquify under existing conditions.</p> <p class="P"><a name="ep290270">An </a><em class="italic">odor</em> is any matter that is a source of an obnoxious odor.</p> <h4 class="H4 head4"> 451.2 <a name="ep290272">Mailability</a></h4> <ol style="list-style-type:lower-alpha;"> <li class="OL1alphaRestart"><a name="ep290274">Liquids and powders that are nonhazardous (i.e., not regulated as hazardous materials) are mailable provided they are properly packaged as specified in </a><span class="zxref"><a href="#ep290284">451.3</a></span>.</li> <li class="OL1alpha"><a name="ep303447">Any matter that is a source of an obnoxious odor is nonmailable.</a></li> </ol> <h5 class="H5 head5"> 451.21 <a name="ep290276">Restrictions</a></h5> <p class="P"><a name="ep290278">Liquids and powders that are corrosive, explosive, flammable, toxic, or otherwise hazardous are subject to the mailing conditions for hazardous materials in Chapter </a><span class="zxref"><a href="pub52c3_001.htm#ep940089">3</a></span>, as applicable.</p> <h5 class="H5 head5"> 451.22 <a name="ep290280">Cremated Remains</a></h5> <p class="P"><a name="ep346822">The following applies when mailing cremated remains (ashes):</a></p> <ol style="list-style-type:lower-alpha;"> <li class="OL1alphaRestart"><em class="italic"><a name="ep346823">Domestic:</a></em> </li> <ol> <li class="OL2alpha"><a name="ep370905">Permitted for cremated remains (human or animal) only when sent via Priority Mail Express service. The item must be packaged as required in </a><span class="zxref"><a href="#ep290284">451.3</a></span><span class="zxref"><a href="#ep290300">b</a></span> and Packaging Instruction 10C. </li> <li class="OL2alpha"><a name="ep370982">The Priority Mail Express mailpiece (USPS-produced or customer supplied) must be marked with Label 139, </a><em class="italic">Cremated Remains,</em> affixed to all sides (including top and bottom), or a mailer may use the special Priority Mail Express cremated remains branded box (BOX-CRE) available on <span class="hyperlink"><a href="http://www.usps.com">usps.com</a></span>.</li> <li class="OL2alpha"><a name="ep370987">Mailers may have a shipping label printed and affixed at a Post Office location or mailers may generate single-ply Priority Mail Express labels through Click-N-Ship or other USPS-approved methods. Mailer generated labels must bear an Intelligent Mail package barcode (IMpb) with the proper cremated remains service type code and include the proper Extra Services code in the Shipping Services File (see Publication 199 on PostalPro at </a><span class="hyperlink"><a href="http://postalpro.usps.com">postalpro.usps.com</a></span>).</li> <li class="OL2alpha"><a name="ep371161">Priority Mail Express mailpieces containing cremated remains are limited to additional insurance and return receipt extra services.</a></li> </ol> <li class="OL1alpha"><em class="italic"><a name="ep342732">International:</a></em> </li> <ol> <li class="OL2alpha"><a name="ep371176">When permitted by the destination country, cremated remains (human or animal) may only be sent via Priority Mail Express International service. Mailers must verify that the destination country accepts Priority Mail Express International and cremated remains before mailing. The contents must be indicated on the applicable customs declaration form. The item must be packaged as required in </a><span class="zxref"><a href="#ep290284">451.3</a></span><span class="zxref"><a href="#ep290300">b</a></span> and Packaging Instruction 10C.</li> <li class="OL2alpha"><a name="ep371177">The Priority Mail Express International mailpiece (USPS-produced or customer supplied) must be marked with a Label 139, </a><em class="italic">Cremated Remains, </em>affixed to all sides (including top and bottom), or a mailer may use the special Priority Mail Express cremated remains branded box (BOX-CRE) available on <span class="hyperlink"><a href="http://www.usps.com">usps.com</a></span>.</li> </ol> </ol> <h4 class="H4 head4"> 451.3 <a name="ep290284">Packaging and Marking</a></h4> <p class="P"><a name="ep290286">The following conditions apply:</a></p> <ol style="list-style-type:lower-alpha;"> <li class="OL1alphaRestart" style="color: #000000; font-style: normal; font-variant: normal; font-weight: normal; text-transform: none; vertical-align: baseline;"><em class="italic"><a name="ep290288">Liquids</a></em>. Nonhazardous liquids, creams, and pastes, particularly those in 1-gallon paint cans with only friction-top closures (push-down tops), are often a source of damage to other mail and postal equipment. The proper packaging of liquids is critical to ensuring the integrity of the mailpiece during handling. Mailers must mark the outer container of a mailpiece containing liquid to indicate the nature of the contents, and include orientation arrows in accordance with <span class="zxref"><a href="pub52c2_012.htm#ep772936">226</a></span>. All liquids are subject to the general packaging requirements in DMM 601.3.4 and the following:</li> <ol> <li class="OL2alphaRestart"><a name="ep290292">Containers having friction–top closures are not acceptable by themselves. Such containers must be packed within a strong and securely sealed outer packaging.</a></li> <li class="OL2alpha"><a name="ep368833">The use of locking rings or similar devices is encouraged when mailing containers with friction-top closures (push-down tops). </a></li> <li class="OL2alpha"><a name="ep290294">Screw caps with a minimum of one and one–half turns, soldering clips, or other effective means must be used to ensure a secure closure.</a></li> <li class="OL2alpha"><a name="ep290296">All nonmetal containers of liquid more than 4 ounces, including plastic containers, and metal containers with friction top closures, must be triple-packaged, and include absorbent material capable of absorbing all of the liquid in the container(s) in case of breakage, a leakproof secondary container, such as a watertight can or plastic bag surrounding the primary container(s), and an outer mailing container that is securely sealed, strong enough to protect the contents, and durable enough to withstand normal processing in Postal Service networks.</a></li> <li class="OL2alpha"><a name="ep290298">Steel pails and drums with carrying handles and positive closures (e.g., locking rings or recessed spouts under screw–cap closures) may be accepted without additional packaging.</a></li> <li class="OL2alpha"><a name="ep368889">As an alternative to 451.3a(4) above, mailers may use containers certified by the International Safe Transit Association (ISTA) to have passed ISTA‘s Test Procedure 3A. Mailers must, upon request, provide written test results verifying that sample mailpieces passed each test outlined in the standard and that no liquids were released. </a></li> </ol> <li class="OL1alpha"><em class="italic"><a name="ep290300">Powders and Cremated Remains.</a></em> Dry materials that could cause damage, discomfort, destruction, or soiling upon escape (leakage) must be packed in siftproof containers or other containers that are sealed in durable siftproof outer containers.</li> </ol> </div> <br /> <br /> <br /> <table border="0" cellspacing="0" cellpadding="2" summary="Document navigation links" class="docNavLinks"> <tr> <td align="left" width="70" class="previous"> <a class="np" href="pub52c4_016.htm" title="Link to "444 Nonmailable Knives in the Mails""> <img src="images/previous.gif" width="63" height="17" alt="Link to "444 Nonmailable Knives in the Mails"" border="0" /> </a> </td> <td width="280" class="middle"> <a class="contents" href="pub52c4_toc.htm" title="Link to contents for "4 Restricted Matter""> <img src="images/contents.gif" width="63" height="17" alt="Link to contents for "4 Restricted Matter"" border="0" /> </a>      <a class="contents" href="" title="Link to Index"><img src="images/index.gif" width="46" height="17" alt="Link to Index" border="0" /></a></td> <td width="70" class="next"> <a class="np" href="pub52c4_018.htm" title="Link to "452 Motor Vehicle Master Keys and Locksmithing Devices""> <img src="images/next.gif" width="46" height="17" alt="Link to "452 Motor Vehicle Master Keys and Locksmithing Devices"" border="0" /> </a> </td> </tr> </table>  </td> </tr> </table> </div> </td> </tr> </table>  </div> </div> </div> </div> </div> </div>  <div class="global-footer-wrap hidden-print" id="global-footer-wrap"> <div class="container"> <footer> <a href="https://www.usps.com/" class="global-footer--logo-link"></a> <div class="row"><div class="col-xs-6"><div class="col-xs-12 col-sm-6"><h3>HELPFUL LINKS</h3><ul><li><a href="https://www.usps.com/help/contact-us.htm" >Contact Us</a></li><li><a href="https://www.usps.com/globals/site-index.htm" >Site Index</a></li><li><a href="http://faq.usps.com/" >FAQs</a></li></ul><h3>USPS JOBS</h3><ul><li><a href="http://about.usps.com/careers/welcome.htm" >Careers</a></li></ul></div><div class="col-xs-12 col-sm-6"><h3>ON ABOUT.USPS.COM</h3><ul><li><a href="http://about.usps.com/" >About USPS Home</a></li><li><a href="http://about.usps.com/news/welcome.htm" >Newsroom</a></li><li><a href="http://about.usps.com/news/service-alerts/welcome.htm" >USPS Service Updates</a></li><li><a href="http://about.usps.com/forms-publications/welcome.htm" >Forms & Publications</a></li><li><a href="https://www.usps.com/gov-services/gov-services.htm" >Government Services</a></li></ul></div></div><div class="col-xs-6"><div class="col-xs-12 col-sm-6"><h3>Other USPS Sites</h3><ul><li><a href="https://gateway.usps.com/" >Business Customer Gateway</a></li><li><a href="https://postalinspectors.uspis.gov/" >Postal Inspectors</a></li><li><a href="http://www.uspsoig.gov/" >Inspector General</a></li><li><a href="https://pe.usps.com/" >Postal Explorer</a></li><li><a href="http://www.postalmuseum.si.edu/" >National Postal Museum</a></li><li><a href="https://www.usps.com/webtools/welcome.htm" >Resources for Developers</a></li><li><a href="https://postalpro.usps.com" >PostalPro</a></li></ul></div><div class="col-xs-12 col-sm-6"><h3>Legal Information</h3><ul><li><a href="http://about.usps.com/who-we-are/privacy-policy/privacy-policy-highlights.htm" >Privacy Policy</a></li><li><a href="http://about.usps.com/termsofuse.htm" >Terms of Use</a></li><li><a href="http://about.usps.com/who-we-are/foia/welcome.htm" >FOIA</a></li><li><a href="http://about.usps.com/who-we-are/no-fear-act/welcome.htm" >No FEAR Act/EEO Contacts</a></li><li><a href="https://about.usps.com/who/legal/accessibility-statement/" >Accessibility Statement</a></li></ul></div></div></div> <div class="row"> <div class="col-sm-12"> <div class="global-footer--copyright"> Copyright © <script type="text/javascript">document.write(new Date().getFullYear());</script> USPS. 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