NON-TOXIC RIM-FIRE PRIMER

摘要

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.