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APCP (Ammonium Perchlorate Composite Propellant) is the primary fuel component of the Shuttle's Solid Rocket Boosters. Though the primary fuel element is Aluminum, it's a mixture of the following elements:

Ammonium Perchlorate (oxidizer, 69.6% by weight), Aluminum (fuel, 16%), Iron Oxide (a catalyst, 0.4%), a polymer (such as PBAN or HTPB, serving as a binder that holds the mixture together and acting as secondary fuel, 12.04%), and an epoxy curing agent (1.96%).

The Space Shuttle's main engines use a combination of Liquid Oxygen (LOx) and Liquid Hydrogen (LH2), stored in the Shuttle external tank.

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13y ago

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