Aluminum foil is a layer of "alloy" which contains 99.4% aluminum. The aluminum foil available at Harijaya Insulation Surabaya is single-sided aluminum foil with straight thread. Aluminum Foil is made in various forms depending on the use or depending on the end result. Harijaya Insulation Surabaya provides and also sells Aluminum foil which is fragile and is sometimes used as a plastic or paper laminate to make it more useful.