Tetryl deflagration

Impure tetryl must be recrystallised with care as it may deflagrate at only 50°C. See other IV-NITRO COMPOUNDS, POLYNITROARYL COMPOUNDS... 

This distinction is more in kind than in degree. Small quantities of primary or initiating explosives usually detonate when exposed to flames or high temperatures whiie secondary explosives usually burn or deflagrate under these conditions. However under slightly altered conditions primary explosives can be made to deflagrate and secondary explosives can be made to detonate. Examples of primary explosives are Lead Azide, Mercury Fulminate, DDNP, etc Examples of secondary explosives are PETN, RDX, HMX, Tetryl, TNT, as single HE compns and Comp B, Comp C, PBX 9404, Dynamite ANFO (Ammonium Nitrate/Fuel Oil) as HE mixtures... 

BM Apparatus, 1kg wt 30 cm with 20 mg sample (Phillips gave 68 cm with 2 kg wt) Initiating Efficiency 0.4 g of LNDR did not initiate Tetryl pressed at 3000 psi Minimum Detonating Charge of MF - 0.24 g Sensitivity to Flame -deflagrates Sensitivity to Spit of BkPdr Fuse -deflagrates Vacuum Stability at 1200 - exploded in 73 mins... 

Liddiard Jacobs (Ref 30) also observed deflagration type reactions with 1.65g/cc Tetryl. 

They found a deflagration threshold pressure of 14kb as compared to 18kb for the detonation threshold. Bartels (Ref 50) investigated the shock behavior of coarse Tetryl at 1.65g/cc in a Plexiglass tube of 2lmm ID. He claims that no reaction occurs below 7.2kb and reaction is observed regularly above 12.1kb. With recrystd Tetryl of a finer particle size, the no-reaction level shifts to 9.1kb, while the reaction level is still 12.1kb... 

Tetranitroanilinobutanolnitrate is a powerful expl(Bal Mortar Test 117% TNT). When heated above its rap it deflagrated at 205— 10° with a brilliant puff without deton, when heated to 216° it ignited in 5 secs. Its Sensitivity to Impact is comparable to that of tetryl(Ref 6). Fairly stable in storage and when heated to 100° when heated in a closed tube at 135° for 30 mins, it exploded. Loss of wt in the 75° International Test 0.1% Hygroscopicity Test at 90% RH and 25° gain in wt 0.06% and at 100% RH 0.19% (Refs 2 3). Its Qv 1250.6 keal/mol and... 

Properties Brownish crystals. Melts with decomposition at 210° and deflagrates at about 226 . Powerful and sensitive high explosive, similar to Tetryl. Detonation rate (d = 1.6) 7500 m/sec. On long storage stability not very satisfactory, particularly in presence of moisture, which tends to promote hydrolysis.37... 

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