Extra Heavy Duty Aluminum Foil is the most versatile of all food wrapping materials for foodservice, restaurant, and cafeteria kitchens. Aluminum foil can withstand heat and cold making it a unique food wrap for cooking. Aluminum Foil is 98% aluminum with the balance being primarily iron and silicon which give it strength and puncture resistance. Heavy Duty Aluminum Foil complies with U.S. Food and Drug Administration requirements for direct contact with food.