Primer caps

Fig 4 is a sketch showing the components of typical primer caps for small arms cartridges,... 

Pin-Fire Cartridge System. A cartridge ignition system invented in 1836 by LeFaucheux of Paris. It was the first practical cartridge system which contained in one unit the cartridge case, the propint, the bullet and the primer cap. A version of this invention is still used today in blank pistols designed in Europe. The cap was... 

Primer Cap or Primer Cup A small metallic container, into which the primer mixture is loaded (Ref 40a, p 112)... 

Primer cap A small metal device containing an impact-sensitive primary high explosive commonly found in ammunition or used in initiators. 

Uses Can be used in detonators when initiated by another primary expl and functioning as an intermediate booster or when mixed with another primary exp to increase the sensitivity of the latter to flame or heat. Its mixture with LA was patented by Dynamit AG (Ref 8) for use in explosive rivets. Tetracene can also be used in primer caps where as little as 2% in the compn results in improved uniformity of percussion sensitivity... 

Munitions rotating bands, primer caps Other costume jewelry, screen wire, ornamental trim, vitreous enamel base... 

According to Davis(Ref 3) this compd is a brisant high expl suitable for use in boosters, detonators, detonating fuses, primer caps, etc. It requires 0.19 g of MF to detonate a 0.4-g sample in the Sand Test and is si more brisant than TNT. In the drop test, it is about the same in sensitivity to impact as Tetryl Refs l)Beil 12,768,(370) [4233 2)R.I.C. 

Chlorates mixed with combustible materials may form expl compns. For example, an expln can occur if a chlorate is mixed with org matter, charcoal or sulfur and the mixt is struck with a hammer or heated. In the expl industry, chlorates are used as oxidg agents in combination with MF, phosphorus, antimony sulfide other combustible substances for primer cap compns. They are also used in pyrotechnic compns for flares aerial bombs, and as a component of permissible expls. Chlorates, as well as perchlorates, are used extensively in the manuf of Cheddites(qv)... 

TNT 5% it was moistened with gum soln pressed in primer caps while wet and b)K chlorate 41.5, Sb sulfide 9.5, CuCNS 4.7 ground glass 44.3% D)Electric primer compns a)K chlorate 60, DADNPh 20, charcoal 15 ... 

The Paris gunmakers, Pr61at Deboubert, patented in 1820 primer cups filled with Ag or Hg fulminates. However, the first practical use of such cups is attributed to E. Wright (ca 1823) and F. Joyce (1824). Percussion primer caps were a great improvement over the old flintlocks. The first priming compns contd MF mixed with chlorates abrasives, some of which are still used today, although more modern formulations, such as those contg LSt, are available in many countries Refs l)Marshall 1 (1917), 37 2 (1917), 516 -20 2)Colver (1918), 513 3)Marshall 3 (1932), 160 4)Hayes (1038), 574 5)Ohart (19461, 51 6)TM 9-1910 (1955), 113-18 209... 

Butyl tetryl is suitable for use in boosters, reinforced detonators, detonating fuse, primer caps, etc. For the detonation of 0.4 gram, it requires 0.19 gram of mercury fulminate. It has a slightly greater shattering effect than TNT in the sand test and shows about the same sensitivity as tetryl in the drop test. It explodes spontaneously at 210°. 

Uses As oxidizing agent in primer caps in combination with mercury fulminate and with red phosphorus, antimony sulfide, and other combustible substances,1 P36. In pyrotechnic mixtures as component of airplane flares, stars for aerial bombs and for signaling, maroons, white and colored smokes. As component of Permissibles. In incendiary projectiles, P5. 

Primer caps and detonators loaded with fulminate of mercury are less sensitive than the dry bulk material but must be handled with great care. Fires involving these assembUes should be treated the same as for the bulk material. They wiU explode as soon as fire reaches them. Stocks in an assembly or loading room should be kept as smaU as possible. Examples of fukninates commonly used in the explosive industry are mercury fulminate, copper fulminate, and silver fulminate. 

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