Ammonium perchlorate composite propellant

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Ammonium perchlorate composite propellant (APCP) is a solid rocket propellant. It differs from many traditional solid rocket propellants such as black powder or zinc-sulfur, not only in chemical composition and overall performance but also by being cast into shape, as opposed to powder pressing^{[broken anchor]} as with black powder. This provides manufacturing regularity and repeatability, which are necessary requirements for use in the aerospace industry.