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Composition B (Comp B), also known as Hexotol and Hexolite (among others), is a high explosive consisting of castable mixtures of RDX and TNT. It is used as the main explosive filling in artillery projectiles , rockets , land mines , hand grenades , and various other munitions . [ 1 ]
Main fill for the Spider Grenade, thus a low critical diameter is required. [ 14 ] The performance of PAX -28, a thermobaric , containing a mixture of RDX , DNAN, Al , AP and MNA was found to have an indoor explosive equivalency factor of 1.62 when compared to Composition B . [ 12 ]
It opened in February 1916, to fill high explosive shells of 4.7 in (120 mm) or larger calibres, with amatol, usually made on site by mixing one part TNT to four parts ammonium nitrate. The factory was under the oversight and management of Viscount Chetwynd , who introduced special features to improve efficiency and safety: by 1916 it was ...
TNT was expensive to make and was in short supply, so Amatol, a mixture of various proportions of TNT and Ammonium nitrate, was adopted instead. [1] On 20 August 1915 Godfrey Chetwynd, 8th Viscount Chetwynd, was given the task of designing, building and superintending the running of a factory to fill large-calibre shells with Amatol. [1]
To assure compliance with safety requirements in newer weapon systems, which are capable of using the M203 Propelling Charge, a conversion to TNT fill in lieu of Composition B was introduced in September 1977 with Type Classification of the M549A1. The M549A1 contains about 15 lb (6.8 kg) of TNT. [citation needed]
General-purpose (GP) bombs use a thick-walled metal casing with explosive filler (typically TNT, Composition B, or Tritonal in NATO or United States service) comprising about 30% to 40% of the bomb's total weight. The British term for a bomb of this type is "medium case" or "medium capacity" (MC).
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The body consists of a hollow steel shell containing high explosive (either TNT or Composition B) painted olive drab with yellow markings. [1] A fuze adapter is screwed into the body and brazed in place. An eyebolt lifting plug is screwed into the fuze well to assist in transportation. The plug is removed and replaced with a fuze for firing.