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Publication 52 - Hazardous, Restricted, and Perishable Mail >
2 General Guidelines > 22 Marking Requirements > 228 Shipping Papers
Mailable hazardous materials eligible to be sent with Priority Mail Express™, Priority Mail®, or First–Class Mail® service must be packaged, labeled, and appropriately documented for air transportation, as required by federal regulations and DMM 601.10.
Mailable hazardous materials sent via air transportation (except materials identified under 346.2 and DMM 601.10.17) must be accompanied with a shipper’s declaration for dangerous goods completed in triplicate and signed by the mailer.
Air carriers may reject mailpieces that are not accompanied by the required shipping papers. See 326 and Exhibit 326 and chapter 7 for more information.