USPS Packaging Instruction 1B

Safety Fuse

Safety fuses consist of a core of black powder overspun with yarns, waterproofing compounds, and/or tapes. A safety fuse assigned identification number UN0105 and classed as a Division 1.4S explosive may be mailed only as permitted in 341.22b and when properly packaged as follows.

Proper Shipping Name

ID Number

Required Authorization

Prior written permission must be obtained from:

DIRECTOR, Product Classification
USPS Headquarters
475 L’Enfant Plaza SW, Room 4446
Washington, DC 20260


Required Packaging

Primary Receptacle
Cushioning Material
Outer Packaging

Note: Full responsibility rests with the mailer to comply with Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) regulations before mailing. At the time of mailing, the mailer must present to the Postal Service acceptance clerk a legible photocopy of the Product Classification director’s approval letter.