Tetryl sand test

But when the shock effect is impinged on other matter, it is indicated by its shattering effect (brisance) - not by the total work effect of the explosive. This might be proved by making Sand Tests of Tetryl loaded at different densities. With different densities and consequent different rates of detonation, there should be different amounts of sand crushed ... 

It is an explosive, comparable in impact sensitivity to MF and more brisant than tetryl, as determined by the sand test (52g of sand crushed compared with 47.7g for tetryl or 109% of tetryl). Its thermal stability is low (Ref 4) and for this reason is not suitable for military purposes, but can be used as a base charge in commercial blasting caps (Ref 3)... 

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... 

A modification of this test applicable to liquid expls is described in Ref 9> PP 9 11. The sand test may also be applied to detg the amt of LA and/or tetryl, that must be used as initiator or booster to insure that the sample crushes the max net wt of sand. This is designated as sensitivity to initiation test. (See also Initiating Efficiency of Primary Explosives by Sand Test.) Refs I)US BurMinesTechPaper 125(1916)... 

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. 

Butyltetryl is an expl comparable in power brisance to TNT(97.5% TNT by Ballistic Mortar Test and the same as TNT by Sand Test) its sensitivity to impact is ca the same as that of Tetryl. It expl at 210° and is si more sensitive to initiation that Tetryl(0.4g requires 0.19g MF vs 0.24g MF for 0.4g Tetryl). Butyltetryl was recommended for use in boosters, reinforced deconators, detonating fuse priming caps(Refs 8, 9 10) [2,4,6-Trinitro-N-nitro-N-(iso-botyl)]... 

Tetryl) >0.5g (vs 0.10g for Amatol) Sand Test 32g (vs 27.4g for Amatol or 38.2g for TNT) and Thermal Stability -less satisfactory than for Amatol... 

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°. 

In the US the sensitivity to initiation is conducted by the sand test using diminishing wts of an initiator, such as LA(lead azide), until there is obtained the min amt which will cause complete detonation of 0.40 g of powdered HE a when pressed in a blasting cap shell under a pressure of 3000 psi. When a HE(such as ammonium picrate) cannot be detonated by LA(or by other initiating expls) alone, the test is repeated by detonating 0.400 g of HE with a composite detonator consisting of 0.200 g LA and tetryl as a base charge. 

A 0.4-g sample of explosive, pressed at 3000 psi into a No. 6 cap, is initiated by lead azide or mercury fulminate (or, if necessary, by lead azide and tetryl) in a sand test bomb containing 200 g of on 30 mesh Ottawa sand. The amount of azide of Tetryl that must be used to... 

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