Aluminum Alloy 7075 offers moderate toughness as well as an excellent strength-to-weight ratio. It becomes stronger at sub-zero temperatures and is a desired material because of its durable stress-corrosion cracking resistance. Aluminum 7075, popular in the aerospace industry, is used in demanding applications such as highly stressed structural parts and aircraft fittings. It is available from Continental Steel in a variety of shapes and sizes, including angles for structural applications.