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A lead-free rim-fire primer mix which utilizes cupric azide, a highly sensitive chemical, as the primary explosive in lieu of lead styphnate. The cupric azide is mixed with carefully selected proportions of nitrocellulose, tetracene, fine particles of ground glass and a binder, typically gum tragaca

A lead-free rim-fire primer mix which utilizes cupric azide, a highly sensitive chemical, as the primary explosive in lieu of lead styphnate. The cupric azide is mixed with carefully selected proportions of nitrocellulose, tetracene, fine particles of ground glass and a binder, typically gum tragacanth. When mixed in the proper proportions, this mix has the required sensitivity, stability, and non-hygroscopicity for regular commercial rim-fire ammunition. The tetracene is not required as a sensitizer, but is used as an ignition aid. The preferred range of percentages are 10-36% by weight of cupric azide, 5-10% by weight of tetracene, 15-30% by weight of nitrocellulose, 20-50% by weight of glass, and 1-2% by weight of a suitable gum.

대표청구항

A lead-free rim-fire primer composition for small arms rim-fire cartridges, the active ingredients of which comprise a mixture of: (a) about 10%-50% by weight of cupric azide; (b) 0-10% by weight of tetracene; (c) 10%-45% by weight of nitrocellulose; and (d) 10%-55% by weight of glass.

A lead-free rim-fire primer composition for small arms rim-fire cartridges, the active ingredients of which comprise a mixture of: (a) about 10%-50% by weight of cupric azide; (b) 0-10% by weight of tetracene; (c) 10%-45% by weight of nitrocellulose; and (d) 10%-55% by weight of glass.