page_title: Composition B
hierarchical_section_title: Composition B
caption_attribution_description: English: Rows of high explosive 155 mm shells sit, about to be fired, as a fire mission is in progress.
context_page_description: Composition B, colloquially "Comp B", is an 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. It was also used for the explosive lenses in the first implosion-type nuclear weapons developed by the United States.
  The standard proportions of ingredients are 59.5% RDX and 39.4% TNT, phlegmatized with 1% paraffin wax. Most commonly it is described as 60/40 RDX/TNT with 1% wax added.
context_section_description: Composition B, colloquially "Comp B", is an 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. It was also used for the explosive lenses in the first implosion-type nuclear weapons developed by the United States.
  The standard proportions of ingredients (by weight) are 59.5% RDX (detonation velocity of 8,750 m/s) and 39.4% TNT (detonation velocity of 6,900 m/s), phlegmatized with 1% paraffin wax. Most commonly it is described as 60/40 RDX/TNT with 1% wax added.
caption: M107 projectiles. All are labelled to indicate a filling of "Comp B" and have fuzes fitted.
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