Tetryl drop test

Pentryl is less sensitive to impact than tetryl (according to Clark, the maximum height causing no explosion in the drop test is 50 cm for pentryl, whereas for tetryl it is 27.5 cm and for picric acid 42.5 cm). 

According to other authors (e.g. Izzo [35]) the difference in sensitiveness between cyclonite and tetryl is insignificant as the following drop test figures, using a 2 kg weight, indicate 30-32 cm for cyclonite, and 40 cm for tetryl. 

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. 

TNA shows about the same sensitivity as tetryl in the drop test. Lead block experiments have been reported which showed that 10 grams of TNA produced a net expansion of 430 cc., TNT 254 cc., picric acid 297 cc., tetryl 375 cc., guncotton 290 cc., and 75 per cent dynamite 300 cc.76 Experiments with the manometric bomb gave the results indicated below. 

Aranaz98 reports that the explosion of tetryl produces a temperature of 3339°. Tetryl is slightly more sensitive than picric acid, and considerably more sensitive than TNT, in the drop test. Experimenting with a 5-kilogram weight, Koehler found that a drop of 150 cm. caused the detonation of tetryl 10 times out of 10 trials, a drop of 100 cm. 9 times out of 10, of 50 cm. 5 times out of 10, and of 40 cm. 3 times out of 10. Martin99 has determined the minimum charges of various primary explosives necessary for the detonation of TNT and tetryl. The explosives were loaded into detonator capsules, and the initiators were compressed upon them at a pressure of 1100 kilos per square centimeter. 

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°. 

He found hexanitrodiphenylamine to be slightly less sensitive in the drop test than tetryl and tetranitroaniline. When 1 pound of the explosive was loaded into a 3.5-inch cubical box of cardboard or tin and fired at with a U.S. Army rifle from a distance of 30 yards, hexanitrodiphenylamine gave no detonations in the cardboard boxes, and 7 detonations and 1 failure in tin TNT gave no detonation in cardboard, fire and detonation in tin and tetryl and tetranitroaniline gave detonations in every case with either kind of container. Marshall reported the velocity of detonation of hexanitrodiphenylamine to be 6898 meters per second at density 1.58, and 7150 meters per second at density 1.67. Pellets of the explosive, mixed with 1 per cent of stearic acid, compressed at 5000 pounds per square inch, had a density 1.43, at 10,000... 

Impact and rifle bullet tests indicate tetryl is more sensitive than TNT. The pendulum friction test, however, produces no detonations with the steel shoe. The explosion temperature test value of tetryl is much lower than that of TNT. For tetryl dropped on a heated copper surface the results in table 8-28 were reported. 

Test 3 Same as Test 2, but add 2-3 drops of DPhA reagent (lg DPhA. in 100ml coned sulfuric acid). Stir and observe the color after 1 min. (Deep blue is produced by NG, NGc, Ednatol, Tetrytol blue is produced by Tetryl, EDNA, NG, NC and BkPdr)... 

Abel (KI) Test at 65.5° — 60+ minutes Behavior Towards Sulfuric Acid. When 2 drops of coned acid were allowed to touch ca 5mg sample placed in a test tube, a slight flash and a rather loud pop resulted Brisance by Sand Test. 0.2g being initiated by 0.24g MF plus 0.15g Tetryl crushed 29.5g sand, which is somewhat above that crushed by 0.2g Tetryl... 

Following props were detd at PicArsn Brisetnce by Sand Test — 0.4g sample detonated by 0.25g MF and 0.25g Tetryl crushed 21 g sand vs 30g for TNT impact Sensitivity, with PicArsn apparatus, using 2kg wt, positive with 18 inches drop initiation Sen sitivity — 0.4g could not be initiated with 0.25g MF alone but did initiate with 0.25g MF + 0.25g Tetryl (Refs 2, 3 4) Refs 1) Beil 6, 33931 2) H.A. Aaronson... 

Some of the complex phenomena occurring in a gap-test with a Tetryl donor charge were investigated in Ref 27. A result of some importance to our subsequent discussion is that the pressure of the NOL LSGT drops to about 1 kb in about 2 microsecs... 

Tetryl or Picrylnitromethylamine(pp 488-89) can be detected by treating(in a micro test tube) a drop of benzenic soln of the sample with powdered manganous sulfate filling the tube to 2/3 of its capacity. After evapg benzene, the tube is immersed (after covering its mouth with a disk of filter paper moistened with Nessler soln) into a bath preheated to 140° and the temp is raised to 150°. A gray or black Stain on the paper appearing within 5 mins indicates the presence of a nitramine, such as tetryl. 

Brisance — no info Decomposition Temperature — 180° with evolution of white fumes Detonation Velocity — 7132m/sec at density 1.35 Heat of Combustion at Cv and 18°— 519kcal/mole Heat of Formation at Cv — 74.6kcal/nole Hygroscopicity — very high Impact Sensitivity with 5kg Weight — at the heights 1.0 to 1.5 meters only 2 detonations out of 100 drops Initiation Sensitivity — detonates very difficultly at density 0.70 by means of 3g MF Power by CUP Method (Modified Trauzl Test) — 69.5% PA vs Tetryl 120% Stability — low... 

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