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Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > Appendix C USPS Packaging Instructions for Mailable Hazardous Materials > USPS Packaging Instruction 10A
Some types of hazardous materials, as permitted in 334 and 49 CFR 173.4,
may be prepared for mailing using the "small quantity" provision. The small
quantity provision, like the ORM-D materials category, is unique within the
United States, and its use is prohibited in international mail.
• Not applicable.
• The complete mailing package must be capable of withstanding the
test criteria in 49 CFR 173.4(a)(6).
• International Mail: Prohibited.
• Domestic Mail: Permitted via air transportation (Express Mail, Priority
Mail, and First-Class Mail) or surface transportation sent as Standard
Mail or Parcel Post.
Inner Receptacle
• Each inner receptacle cannot be liquid-full at 131° F (55° C).
• Each inner receptacle must be constructed of plastic with a minimum
thickness of no less than 0.2 mm (0.008 inch) or must be made of
earthenware, glass, or metal.
• Each inner receptacle must be securely sealed with wire, tape, or other
positive means.
Absorbent and Cushioning Material
• Sufficient absorbent material that will not react chemically with the
hazardous material must fully surround each inner receptacle and be
capable of absorbing the entire liquid contents of the inner
receptacle(s) in case of leakage.
• Each primary receptacle must be surrounded by sufficient cushioning
material to absorb shock and prevent breakage.
• The absorbent and cushioning materials used must not violate 49 CFR
173.21.
Secondary Packaging
• Each inner receptacle and the absorbent cushioning material must be
placed within a securely sealed secondary packaging.
Outer Packaging
• The secondary packaging must be securely packed in a strong outer
packaging.
• The total weight of each mailpiece must not exceed 64 pounds (29 kg).
Marking
• The address side of each mailpiece sent under the small quantity
provision must be clearly marked with "This package conforms to
49 CFR 173.4."
• A complete return address and delivery address must be used.
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