If you don't know, iron oxide is rust and the aluminium needs to be a powder or small granules. Just FYI. (Below fwjs28 says where you can get Al powder easy.)
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its iron oxide and aluminium
i think its 7:3 by volume
http://www.instructables.com/tag/?q=thermite&limit%3Atype%3Aid=on&type%3Aid=on&type%3Auser=on&type%3Acomment=on&type%3Agroup=on&type%3AforumTopic=on&type%3AforumTopic=on&sort=none
L