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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 4B
Safety matches (book, card, or strike-on-box) may be mailed only in
domestic mail via surface transportation, provided all applicable requirements
in 344 are met, including:
They do not ignite spontaneously under conditions normally incident to
transportation or when subjected for eight consecutive hours to a
temperature of 200°F (93°C).
They cannot be readily ignited by friction unless struck on their own or on a
similar box, card, or book.
Note: Strike-anywhere matches assigned UN1331 and other types of
matches assigned UN2254 or UN1945 are nonmailable.
• Matches, Safety.
• UN1944.
• International Mail: Prohibited.
• Domestic Mail: Permitted only via surface transportation sent as
Standard Mail or Parcel Post.
Primary Receptacle
• Mailable types of safety matches must be tightly packed in a securely
sealed primary receptacle to prevent any shifting or movement that
could cause accidental ignition by rubbing against adjoining items.
• Multiple primary receptacles are permitted per mailpiece.

Outer Packaging
• The outer packaging material must be made of fiberboard, wood, or
other equivalent and be strong enough to prevent the inner contents
from bursting through.
• The primary container(s) must be snugly packed within the outer
packaging.
• Each mailpiece must not exceed a total weight of 25 pounds.
Marking
• The address side of each mailpiece must be clearly marked "Surface
Only" or "Surface Mail Only" and either "Book Matches", "Card
Matches," or "Strike-on-Box Matches," as applicable.
• A complete return address and delivery address must be used.
Documentation
• A shipping paper is not required.
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