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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">  <div class="mercurybanner alert alert-danger" style="font-size:16px" role="alert"> <strong> The Postal Service is reminding customers that metallic mercury and devices containing metallic mercury are always prohibited in the mail stream. This includes antique items such as thermometers, barometers, blood pressure monitors and similar devices. </strong> </div> <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">Publication 52 - Hazardous, Restricted, and Perishable Mail</p>   <table border="0" cellspacing="0" cellpadding="2" summary="Document navigation links" class="docNavLinks"> <tr> <td align="left" width="70" class="previous"> <img src="images/blank.gif" width="63" height="17" alt="" border="0" /> </td> <td width="280" class="middle">      <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="pub52un.htm" title="Link to "Summary of Changes"" accesskey="n"> <img src="images/next.gif" width="46" height="17" alt="Link to "Summary of Changes"" border="0" /> </a> </td> </tr> </table>  <a name="content"></a> <div> <h1 class="doctitle">Publication 52 - Hazardous, Restricted, and Perishable Mail</h1> <p class="docrev">September 7, 2023</p> <br /> <table> <tr> <td width="10"> </td> <td class="tocColumn" valign="top" align="left"> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52un.htm">Summary of Changes</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52tl.htm">Transmittal Letter</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c1_001.htm">1 Introduction</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c1_001.htm#ep392279">11 Purpose</a> </li> <li><a class="map-link" href="pub52c1_004.htm">12 Scope</a> </li> <li><a class="map-link" href="pub52c1_007.htm">13 Additional Information</a> </li> <li><a class="map-link" href="pub52c1_008.htm">14 Safety</a> </li> <li><a class="map-link" href="pub52c1_009.htm">15 Protecting Personnel</a> </li> <li><a class="map-link" href="pub52c1_010.htm">16 Military Postal System</a> </li> <li><a class="map-link" href="pub52c1_011.htm">17 Statutory System</a> </li> <li><a class="map-link" href="pub52c1_012.htm">18 Trademarks of the USPS</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c2_001.htm">2 General Guidelines</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c2_001.htm#ep772764">21 Mailability</a> </li> <li><a class="map-link" href="pub52c2_007.htm">22 Marking Requirements</a> </li> <li><a class="map-link" href="pub52c2_015.htm">23 Handling Hazardous Materials</a> </li> <li><a class="map-link" href="pub52c2_017.htm">24 Emergency Procedures</a> </li> <li><a class="map-link" href="pub52c2_023.htm">25 Basic Guidelines for Postal Service Personnel</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c3_001.htm">3 Hazardous Materials</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c3_001.htm#ep940337">31 Definition</a> </li> <li><a class="map-link" href="pub52c3_002.htm">32 General</a> </li> <li><a class="map-link" href="pub52c3_011.htm">33 Hazard Classes</a> </li> <li><a class="map-link" href="pub52c3_020.htm">34 Mailability by Hazard Class</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c4_001.htm">4 Restricted Matter</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c4_001.htm#ep306072">41 General</a> </li> <li><a class="map-link" href="pub52c4_005.htm">42 Intoxicating Liquors</a> </li> <li><a class="map-link" href="pub52c4_008.htm">43 Firearms</a> </li> <li><a class="map-link" href="pub52c4_013.htm">44 Knives and Sharp Instruments</a> </li> <li><a class="map-link" href="pub52c4_017.htm">45 Other Restricted Materials</a> </li> <li><a class="map-link" href="pub52c4_023.htm">46 Animal-Fighting Ventures</a> </li> <li><a class="map-link" href="pub52c4_025.htm">47 Cigarettes, Smokeless Tobacco, and Electronic Nicotine Delivery Systems</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c5_001.htm">5 Perishable Matter</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c5_001.htm#ep183801">51 Definition</a> </li> <li><a class="map-link" href="pub52c5_003.htm">52 Animals</a> </li> <li><a class="map-link" href="pub52c5_009.htm">53 Fresh Foods and Other Perishables</a> </li> <li><a class="map-link" href="pub52c5_010.htm">54 Eggs</a> </li> <li><a class="map-link" href="pub52c5_011.htm">55 Meats and Meat Products</a> </li> <li><a class="map-link" href="pub52c5_012.htm">56 Plants</a> </li> <li><a class="map-link" href="pub52c5_016.htm">57 Nonmailable Plant Pests, Injurious Animals, and Illegally Taken Fish or Wildlife</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c6_001.htm">6 International Mail</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c6_001.htm#ep271738">61 General</a> </li> <li><a class="map-link" href="pub52c6_003.htm">62 Hazardous Materials: International Mail</a> </li> <li><a class="map-link" href="pub52c6_006.htm">63 Restricted Matter: International Mail</a> </li> <li><a class="map-link" href="pub52c6_013.htm">64 Perishable Matter: International Mail</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52c7_001.htm">7 Air Transportation Requirements</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52c7_001.htm#ep760103">71 General</a> </li> <li><a class="map-link" href="pub52c7_003.htm">72 Hazardous Materials: Air Transportation</a> </li> <li><a class="map-link" href="pub52c7_011.htm">73 Restricted Matter: Air Transportation</a> </li> <li><a class="map-link" href="pub52c7_013.htm">74 Perishable Matter: Air Transportation</a> </li> </ul> <br /> </td> <td class="v-single-dots" width="40" valign="top" align="center"></td> <td class="tocColumn" valign="top" align="left"> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxa.htm">Appendix A</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxb.htm">Appendix B</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxc_001.htm">Appendix C</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52apxc_002.htm">USPS Packaging Instruction 1A</a> </li> <li><a class="map-link" href="pub52apxc_003.htm">USPS Packaging Instruction 1B</a> </li> <li><a class="map-link" href="pub52apxc_004.htm">USPS Packaging Instruction 2A</a> </li> <li><a class="map-link" href="pub52apxc_005.htm">USPS Packaging Instruction 2B</a> </li> <li><a class="map-link" href="pub52apxc_006.htm">USPS Packaging Instruction 2C</a> </li> <li><a class="map-link" href="pub52apxc_007.htm">USPS Packaging Instruction 2D</a> </li> <li><a class="map-link" href="pub52apxc_008.htm">USPS Packaging Instruction 2E</a> </li> <li><a class="map-link" href="pub52apxc_009.htm">USPS Packaging Instruction 2F</a> </li> <li><a class="map-link" href="pub52apxc_010.htm">USPS Packaging Instruction 3A</a> </li> <li><a class="map-link" href="pub52apxc_011.htm">USPS Packaging Instruction 3B</a> </li> <li><a class="map-link" href="pub52apxc_012.htm">USPS Packaging Instruction 3C</a> </li> <li><a class="map-link" href="pub52apxc_013.htm">USPS Packaging Instruction 3D</a> </li> <li><a class="map-link" href="pub52apxc_014.htm">USPS Packaging Instruction 4A</a> </li> <li><a class="map-link" href="pub52apxc_015.htm">USPS Packaging Instruction 4B</a> </li> <li><a class="map-link" href="pub52apxc_016.htm">USPS Packaging Instruction 5A</a> </li> <li><a class="map-link" href="pub52apxc_017.htm">USPS Packaging Instruction 6A</a> </li> <li><a class="map-link" href="pub52apxc_018.htm">USPS Packaging Instruction 6B</a> </li> <li><a class="map-link" href="pub52apxc_019.htm">USPS Packaging Instruction 6C</a> </li> <li><a class="map-link" href="pub52apxc_020.htm">USPS Packaging Instruction 6D</a> </li> <li><a class="map-link" href="pub52apxc_021.htm">USPS Packaging Instruction 6E</a> </li> <li><a class="map-link" href="pub52apxc_022.htm">USPS Packaging Instruction 6F</a> </li> <li><a class="map-link" href="pub52apxc_023.htm">USPS Packaging Instruction 6G</a> </li> <li><a class="map-link" href="pub52apxc_024.htm">USPS Packaging Instruction 6H</a> </li> <li><a class="map-link" href="pub52apxc_025.htm">USPS Packaging Instruction 7A</a> </li> <li><a class="map-link" href="pub52apxc_026.htm">USPS Packaging Instruction 8A</a> </li> <li><a class="map-link" href="pub52apxc_027.htm">USPS Packaging Instruction 8B</a> </li> <li><a class="map-link" href="pub52apxc_028.htm">USPS Packaging Instruction 8C</a> </li> <li><a class="map-link" href="pub52apxc_029.htm">USPS Packaging Instruction 9A</a> </li> <li><a class="map-link" href="pub52apxc_030.htm">USPS Packaging Instruction 9B</a> </li> <li><a class="map-link" href="pub52apxc_031.htm">USPS Packaging Instruction 9C</a> </li> <li><a class="map-link" href="pub52apxc_032.htm">USPS Packaging Instruction 9D</a> </li> <li><a class="map-link" href="pub52apxc_033.htm">USPS Packaging Instruction 9E</a> </li> <li><a class="map-link" href="pub52apxc_034.htm">USPS Packaging Instruction 10A</a> </li> <li><a class="map-link" href="pub52apxc_035.htm">USPS Packaging Instruction 10B</a> </li> <li><a class="map-link" href="pub52apxc_036.htm">USPS Packaging Instructions 10C</a> </li> <li><a class="map-link" href="pub52apxc_037.htm">USPS Packaging Instruction 10D</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxd.htm">Appendix D</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxe_001.htm">Appendix E</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52apxe_002.htm">Postal Service Publications and Reference Materials</a> </li> <li><a class="map-link" href="pub52apxe_003.htm">Other Publications</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxf.htm">Appendix F</a> <br /><br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="pub52apxg_001.htm">Appendix G</a> <ul type="square" class="map-link"><li><a class="map-link" href="pub52apxg_002.htm">STCs Domestic Outbound (Required)</a> </li> <li><a class="map-link" href="pub52apxg_003.htm">STCs Domestic Outbound (Optional)</a> </li> <li><a class="map-link" href="pub52apxg_004.htm">STCs Domestic Returns (Required)</a> </li> <li><a class="map-link" href="pub52apxg_005.htm">STCs Domestic Returns (Optional)</a> </li> <li><a class="map-link" href="pub52apxg_006.htm">ESCs Domestic (Optional)</a> </li> <li><a class="map-link" href="pub52apxg_007.htm">ESCs Domestic and International, including APO/FPO/DPO (Required)</a> </li> <li><a class="map-link" href="pub52apxg_008.htm">ESCs International and APO/FPO/DPO (Required)</a> </li> </ul> <br /> <img src="images/bullet_666.gif" alt="" height="9" width="5" border="0" /> <a class="head-grey" href="index.htm">Index</a> <br /><br /> </td> </tr> </table> </div> <br /> <br /> <br /> <table border="0" 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