USPS Packaging Instruction 9C

Miscellaneous Hazardous Materials

A Class 9 miscellaneous hazardous material that qualifies as a Limited Quantity material within the Postal Service is permitted in domestic mail provided all applicable requirements in 349 are met.

Proper Shipping Name

• Consumer Commodity.

ID Number

• Various (refer to Appendix A).

Mailability

• International Mail: Prohibited.
• Domestic Mail: Permitted via air or surface transportation. Flammable materials are prohibited from air transportation.

Required Packaging

Primary Receptacle

• For liquids, the capacity of the primary receptacle must not exceed 1 pint.
• For solids, the weight of the primary receptacle and its contents must not exceed 1 pound.
• Multiple primary receptacles are permitted.

Cushioning Material

• Enough cushioning material must surround the primary receptacle to prevent breakage and absorb all potential leakage.

Outer Packaging

• A strong outer packaging that is capable of firmly and securely holding the primary receptacle and cushioning material is required. Refer to 339.4.
• Each mailpiece must not exceed a total weight of 25 pounds.

Marking

Labels and markings must be placed on the address side of the mailpiece unless specified differently in 221.1 and 325.1.

• For air transportation, mailpieces must bear the DOT Limited Quantity air mark (with the symbol “Y” in the center), an approved DOT Class 9 hazardous material warning label, Identification Number “ID8000,” and the proper shipping name “Consumer Commodity.”
• For surface transportation, the outer packaging must bear an approved DOT Limited Quantity surface mark designating surface transportation, prepared under 349.4(b).
• A complete return and delivery address must be used.

Documentation

• For air transportation, a mailable material must have a properly completed Shipper‘s Declaration for Dangerous Goods prepared in triplicate and affixed to the outside of the mailpiece.