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Originally Posted by shegeek72
...the external skin that was coated with a mixture of aluminum particles and iron oxide (the solid fuel in the shuttle rockets!)
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That's not the shuttle rocket fuel, that's thermit (welding and incendiary material). The SRB's only contain a very small amount of iron as a catalyst, they're mostly made with aluminium, ammonium perchlorate and rubber.
http://www.nasa.gov/returntoflight/s...ystem_SRB.html (on the left)