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- Composition_C abstract "The Composition C family is a family of related US-specified plastic explosives consisting primarily of RDX. All can be moulded by hand for use in demolition work and packed by hand into shaped charge devices. Variants have different proportions and plasticisers and include composition C-2, composition C-3, and composition C-4.The term composition is used for any explosive material compounded from several ingredients. In particular, in the 1940s the format "Composition <letter>" was used for various compositions of the (relatively) novel explosive RDX, such as Composition B and other variants.The original material was developed by the British during World War II, and standardised as Composition C when introduced to US service. This material consisted of 88.3% RDX and a mineral oil-based plasticiser and phlegmatiser. It suffered from a relatively limited range of serviceable temperatures, and was replaced by Composition C-2 around 1943.Composition C-2 contained a slightly smaller proportion of RDX, but used an explosive plasticiser, which contained tetryl, nitrocellulose and a mixture of nitroaromatics produced during the manufacture of TNT (containing trinitrotoluene, dinitrotoluene and mononitrotoluene), and a trace of solvent. While Composition C-2 had a much wider serviceable temperature range than Composition C, it could not be stored at elevated temperatures. Consequently it was replaced around 1944 by Composition C-3.Composition C-3 was very similar to Composition C-2, but removed the solvent and varied the exact proportions of plasticisers to improve high temperature storage. It is a yellow, putty-like material. It remained a service item through the Korean War, but had marginal plasticity at the very low temperatures encountered in Korean winters, and was significantly toxic, including by vapour and skin absorption. The velocity of detonation is about 7600 m/s (25,000 feet per second.)Composition C-3 consists: 77%÷85% cyclonite (RDX) and 15%÷23% gel made out of liquid nitro compounds (e.g. liquid DNT and small amount of NT) and nitrocellulose or butyl phthalate and nitrocellulose.One of the first reported and tested Composition of C-3 was very similar to earlier Composition C-2 and contained: 77% of RDX, 3% of tetryl, 4% of TNT, 1% of NC, 5% of NT, and 10% of DNT. The last two compounds (they are very poor explosives) are oily liquids and plasticize the mixture. The most important later innovation of C-3 there was introduced non-explosives plasticizer butyl phthalate instead of this mixture of nitro compounds. In such way the toxicity of C-3 was reduced, the concentration of RDX was increased, it improved safety of usage and storage. it also opened way to start study on applying new non-explosive and low toxic plasticizer (esters dicarboxylic acid) and binder (branched polymers).Research on a replacement for C-3 was begun prior to 1950, but the new material, new generation of Composition C (number four, C-4), did not begin pilot production until 1956.The Composition C-3 was improved and designed as well-known Composition C-4.Since 1960 the mixture of C-4 has contained: 90.0÷91.0% of cyclonite (RDX explosives) ~2.1% of polyisobutylene (short chain) ~1.6% of motor oil ~5.3% of di-(2-ethylhexyl)sebacate (sometimes it was replaced partly by similar compounds: dioctyl sebacate or dioctyl adipate) less than 0.6% of water (small amount of marker or odorizing taggant)It is less volatile than C-3 and has less tendency to harden at low temperature. It has a density 1.48÷1.60g/ml, does not become hard even at -55°C (-70°F), and does not excude at +77°C (170°F).C4 has a detonation velocity of 8,092 m/s (26,550 ft/s) at high density and velocity of 7,550 m/s (24,770 ft/s) at low density 1.48g/ml. It is so successful that it remains in army service up to current time without any significant changes.".
- Composition_C wikiPageID "1123493".
- Composition_C wikiPageRevisionID "582099870".
- Composition_C hasPhotoCollection Composition_C.
- Composition_C subject Category:Explosives.
- Composition_C type Abstraction100002137.
- Composition_C type Chemical114806838.
- Composition_C type Explosive103304730.
- Composition_C type Explosives.
- Composition_C type Material114580897.
- Composition_C type Matter100020827.
- Composition_C type Part113809207.
- Composition_C type PhysicalEntity100001930.
- Composition_C type Relation100031921.
- Composition_C type Substance100019613.
- Composition_C comment "The Composition C family is a family of related US-specified plastic explosives consisting primarily of RDX. All can be moulded by hand for use in demolition work and packed by hand into shaped charge devices. Variants have different proportions and plasticisers and include composition C-2, composition C-3, and composition C-4.The term composition is used for any explosive material compounded from several ingredients.".
- Composition_C label "Composition C".
- Composition_C label "Composition C".
- Composition_C sameAs Composition_C.
- Composition_C sameAs m.0487w3.
- Composition_C sameAs Q2990635.
- Composition_C sameAs Q2990635.
- Composition_C sameAs Composition_C.
- Composition_C wasDerivedFrom Composition_C?oldid=582099870.
- Composition_C isPrimaryTopicOf Composition_C.