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Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > 3 Hazardous Materials > 33 Hazard Classes > 335 Packaging Requirements for Hazardous Materials

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335 Packaging Requirements for Hazardous Materials

335.1 DOT Packing Groups

Hazardous materials in Classes 1, 3-6, and 8-9 are assigned to a DOT packing group based on the degree of danger presented by the material during transport. The packing group assigned to a hazardous material is listed in column 5 of the Hazardous Material Table in 49 CFR 172.101 and in column (d) of Appendix A. Packing Group I indicates a great danger, Packing Group II a medium danger, and Packing Group III a minor danger.

335.2 Postal Service Packaging Instructions

For mailing purposes, the packaging of a mailable hazardous material must follow the appropriate Packaging Instruction in Appendix C. The correct Packaging Instruction to use for a specific hazardous material can be determined using Appendix A.

Mailers may not package or combine hazardous materials assigned to different hazard classes within a single mailpiece unless permitted by Postal Service standard.




Link to "334 Small Quantity"Link to contents for "3 Hazardous Materials"      Link to IndexLink to "336 Nonmailable Materials Found in the Mailstream"