328 Postal Service Hazardous Materials Table

Appendix A, Hazardous Materials Table: Postal Service Mailability Guide, contains a modified version of the DOT Hazardous Materials Table found in 49 CFR § 172.101. Appendix A lists the hazardous materials from 49 CFR and identifies eligibility for mailing in the domestic mail via air and surface transportation. This table can be used to determine the mailability of a hazardous material if the proper shipping name of the material is known.

When only the UN number is known, Appendix B, Numerical Listing of Proper Shipping Names by Identification (ID) Number, can be used to locate a proper shipping name for cross-referencing back to Appendix A. The mailability information in Appendix A is based on the DOT requirements and Postal Service mailability policy. The table does not include specific information for international mail because almost all hazardous materials are prohibited in international mail. Refer to Chapter 6 for specific requirements that apply to international mail.