Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > Appendix C USPS Packaging Instructions for Mailable Hazardous Materials > USPS Packaging Instruction 2B

USPS Packaging Instruction 2B

Nonflammable Gases

A Class 2 nonflammable gas that can qualify as an ORM-D material may be mailed provided that all applicable requirements in 342 are met and it is properly packaged as follows.

Proper Shipping Name

• Consumer Commodity.

ID Number

• Various (see Appendix A).

Mailability

• International Mail: Prohibited.

• Domestic Mail: Permitted with restrictions via air transportation (Express Mail, Priority Mail, or First-Class Mail) and permitted via surface transportation sent as Standard Mail or Parcel Post.

Required Packaging

Primary Receptacle(s)

• The capacity of an other-than-metal (nonmetal) primary receptacle must be 4 fluid ounces (7.22 cubic inches) or less per mailpiece.

• The capacity of a metal primary receptacle must be 33.8 fluid ounces (1-liter or 61.0 cubic inches) or less.

• The liquid content of the material and the gas must not completely fill the primary receptacle at 130° F.

• A DOT 2P container must be used if the internal pressure is from 140 psig to 160 psig at 130° F (55° C). A DOT 2Q container must be used if the pressure is from 161 psig to 180 psig at 130° F (55° C).

• A container with an internal pressure more than 180 psig at 130° F (55° C) is prohibited from mailing.

• The primary receptacle(s) must be packaged to protect valves and fittings and to ensure integrity during transport.

• The primary receptacle(s) must have a recessed valve, screw-thread cap, tap closure, or other means to prevent accidental discharge.

Cushioning Material

• Sufficient cushioning material must surround the primary receptacle to absorb shock and prevent damage.

Outer Packaging

• Strong outer packaging that is capable of firmly and securely holding the primary receptacle(s) and cushioning material is required.

• Multiple primary receptacles may be securely packed within a single strong outer packaging.

• Each mailpiece must not exceed a total weight of 25 pounds.

Marking

• For air transportation, each mailpiece must be clearly marked on the address side with "Consumer Commodity ORM-D AIR."

• For surface transportation, each mailpiece must be clearly marked on the address side with "Surface Only" or "Surface Mail Only" and "Consumer Commodity ORM-D."

• A complete return address and delivery address must be used.

Documentation

• For air transportation, a mailable, nonflammable gas must have a properly completed shipper's declaration for dangerous goods prepared in triplicate and affixed to the outside of the mailpiece.