What house hold materials contain 100% pure aluminum. or where can i buy it. im making thermite, which ive made before so don\'t say, its dangerous don\'t do it, but do i need 100% pure aluminum or will some aluminum alloy with like 90% aluminum work?????Aluminum foil is your best bet. According the the Reynold\'s wrap web site, their foil is 98.5% aluminum.Other related question