Percussion sensitivity

The anhydrous salt explodes on impact [1], and decomposes violently at 200°C [2], The trihydrate is also percussion sensitive [3] though other sources suggest that in clean, grease- and oil-free equipment the anhydrous salt is shockproof [4], A bottle of the purified anhydrous salt exploded then burnt on opening, (transition to... 

Ad 181) G.W.C. Taylor et al, BritP 1086861(1967) CA 68, 1422(1968)(Finely divided B is incorporated into primary expls to reduce their sensitivity to accidental ignition by electrostatic sparks. In some cases, this incorporation also increases the power percussion sensitivity of the expls) Ad 182) D.M. Welsh, CanP 770392(1967)... 

Hydroxymethyl Methyl Peroxide Violently explosive, on heating becomes percussion-sensitive A. Rieche F. Hitz, Ber 62, 2458 (1929)... 

K) H. Schleuter F. Hermann, GerP 1944844 (1971) CA 74, 143986(1971) (Pressed expls of low percussion sensitivity contd NGu and 5—12% eutectic mixts of 2,4,6(02N)3C6H2-NMeN02 and its N-Et analog. NGu contg 10% eutectic had 8400m/sec deton vel, compared with 7600 for pure NGu)... 

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... 

Small percussion-sensitive explosive charges, encased in a cap and used to ignite propellant powder (- Percussion Cap). 

HGNTA forms heavy, granular crystals, which are not very soluble in water—the crystals are stable in nitric acid. HGNTA detonates when heated to 215 Celsius. Its percussion sensitivity is similar to mercury fulminate, and it s used in primers for bullets and the like. It can also be used in booster compositions in place of, or in combination with lead azide or... 

CHAPTER 17 THE PREPARATION OF NITRO TETRAZOLES LNTA forms heavy, granular, yellowish white crystals, which are not very soluble in water—the crystals are more readily soluble in hot water. LNTA detonates when heated to 220 Celsius, and is slightly more percussion sensitive then mercury fulminate as a result, its use in priming compositions has been questioned, but it can be safely desensitized by mixing with dextrose, flour, or gum Arabic immediately after preparation. The desensitized product can be successfully used in priming compositions for use in bullet primers and the like. ... 

Copp et al. believed that percussion sensitiveness (with the ball and disk apparatus) was very complex and involved, in addition to the formation of hot spots through friction, a tribochemical reaction in which there was a more direct transfer of mechanical energy to activation energy than was the case when the mechanical energy is first converted to heat. An example of this is shown with experiments using nickel and tin disks to confine Service lead azide in which the surfaces of the low melting point lessened the grit sensitivity but enhanced the impact sensitivity. 

The initiators are sensitive to friction and shock (blow). The percussion sensitivity is measured by the drop-hammer method where a 2 kg steel ball is dropped from increasing heights tmtil detonation occurs. The amount of electrical energy needed to initiate the detonation depends on the initiator. 

---