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Semtex is a general-purpose plastic explosive containing RDX and PETN. [1] It is used in commercial blasting, demolition , and in certain military applications. Semtex was developed and manufactured in Czechoslovakia , originally under the name B 1 and then under the "Semtex" designation since 1964, [ note 1 ] labeled as SEMTEX 1A , since 1967 ...
A C-4 charge packed onto a marine anchor chain. Plastic explosives are especially suited for explosive demolition of obstacles and fortifications by combat engineers as they can be easily formed into ideal shapes for cutting structural members and have a high enough velocity of detonation and density for metal cutting work.
RDX is often used in mixtures with other explosives and plasticizers or phlegmatizers (desensitizers); it is the explosive agent in C-4 plastic explosive and a key ingredient in Semtex. It is stable in storage and is considered one of the most energetic and brisant of the military high explosives, [2] with a relative effectiveness factor of 1.60.
C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odorizing taggant chemical.
Post-World War II German DM41 fragmentation hand grenade filled with Composition B. This example has been dissected to reveal the steel fragmentation sleeve and yellow explosive charge. Composition B (Comp B), also known as Hexotol and Hexolite (among others), is a high explosive consisting of castable mixtures of RDX and TNT.
PETN is used in a number of compositions. It is a major ingredient of theSemtex plastic explosive. It is also used as a component of pentolite, a castable mixture with TNT (usually 50/50 but may contain more TNT), which is, along with pure PETN, a common explosive for boosters for the blasting work (as in mining).
The first blasting cap or detonator was demonstrated in 1745 when British physician and apothecary William Watson showed that the electric spark of a friction machine could ignite black powder, by way of igniting a flammable substance mixed in with the black powder.
Gelignite does burn safely. Some idiots use it to light safety fuse if they don't have a cheesa stick but don't drop it into water or it will explode. Contrary to the article, it does sweat after a while. It also gives you a rotten headache if you have to work with it for long, like making up primers. The article needs to be rewritten.