Caps, blasting

Tellurium improves the machinability of copper and stainless steel, and its addition to lead decreases the corrosive action of sulfuric acid on lead and improves its strength and hardness. Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control. Tellurium is used in ceramics. Bismuth telluride has been used in thermoelectric devices. 

Blasting caps Blasting compositions Blasting metals Blastomycosis... 

Pentaerythritol tetranitrate is a high energy explosive that is used as a pressed base charge in blasting caps and detonators, as the core explosive in commercial detonating cord, and as the main explosive ingredient in sheet explosives. It is also mixed in various proportions with TNT to form the less sensitive pentoHtes, eg, PETN 50/TNT 50. PETN is easily initiated, its responses are reproducible, and it is readily available (144—146). 

Tetiyl. 2,4,6-Trinitrophenylmethylm tramine (tetryl) was used ia pressed form, mostly as a booster explosive and as a base charge ia detonators and blasting caps because of its sensitivity to initiation by primary explosives and its relatively high energy content. Properties are presented ia Table 11 (173). Batch and continuous processes for the production of tetryl have been developed. Tetryl is no longer used ia the United States and has been replaced by RDX (174-178). 

The insensitivity of nitromethane to detonation by shock under normal conditions of handling has been demonstrated by a number of fljH-scale tests. Sensitivity to shock increases with temperature at 60° C, nitromethane can be detonated by a No. 8 blasting cap. Nitroethane can be initiated only when heated near its boiling point under heavy confinement neither it or the nitropropanes can be detonated in unconfined conditions. 

Selenium and selenium compounds are also used in electroless nickel-plating baths, delayed-action blasting caps, lithium batteries, xeroradiography, cyanine- and noncyanine-type dyes, thin-film field effect transistors (FET), thin-film lasers, and fire-resistant functional fluids in aeronautics (see... 

Confinement cap test. Detonatability of a material is determined using a blasting cap. 

Nitroglycerin was discovered by Ascanio Sobrero, in 1846. Its danger made it a laboratoiy curiosity until Alfred Nobel improved it along with other inventions such as the blasting cap ing mercury fulminate. 

Napfehen, n. cup little bowl or basin blank (for blasting caps) cupule. -kobalt, m. flaky metallic arsenic. 

When placed in air-tight Fe or A1 containers, they can be used for underwater work. In such cases it is not necessary to insert the blasting cap into the acid charge, but merely to press it against the outside of the sheet metal with an insulating band. Since fuzes burn underwater, it can be lighted in the air, and the entire assembly then placed at the required depth... 

All NCN blasting agents and each of their components must be cap-insensitive, ie, incapable of being detonated when initiated by a No 8 blasting cap. Both Nitro-Carbonitrates and Amm nitrate are grouped by the ICC as oxidizing materials with normal transportation (yell°w label) being permitted (Ref 1)... 

Its expl properties were strength by Trauzl Test, 330 to 350cc, and detonation velocity 3000 to 500Qm/sec. The mining authorities prescribed the use of the strongest blasting cap to ensure detonation, but when well confined, a fuse alone caused expin (See also Ref 3, El Ref 4, Ger 42-L Ger 121-L)... 

In general terms, PETN can be characterized as a sensitive , brisant, and powerful high expl. Explosive sensitivity is a rather nebulous quantity, but there can be no doubt that PETN is a much more sensitive material than TNT, but rather less sensitive than Lead Azide. In particular, PETN requires very little priming i charge (less than 1 mg LA) to initiate its detonation. This is the characteristic that makes PETN so widely used in blasting cap base charges, in detonating cord and in boosters... 

Block (Engineer Corps Special Blasting Cap used for initiation), dent, inches 0.109... 

Ref 7a). According to Swern (Ref 9) experimentation using blasting caps performed on both eth acet and acet ac solns of peroxyacetic acid has resulted in the data presented in Fig 3... 

Potassium Dinitroazidophenolate (called Potassium Dinitrophenylazide by McNutt). K0,N3.CgH2(N02)2. It was proposed as an ingredient of primer mixts suitable for small srms and artillery ammo, commercial blasting caps, etc. Typical mixts suggested were 1)K Dinitroazidophenolate 16, Basic Pb Styphnate 15, Ba nitrate 40, Sb silicide 29% 2) K Dinitroazidophenolate 17, Basic Pb Styphnate 18, Ba nitrate 35, Pb thiocyanide 5, ground glass 25%... 

---