Aluminum parts : Aluminum Parts are economical, light weight and attractive. Parts made from this metal are often less expensive because they can be machined in less time than many other metals such as steel and do not require additional finishes. As the pure metal is soft, small amounts of copper, magnesium, zinc and other elements are added for strength. It is resistant to corrosion as a thin protective layer is formed when exposed to the atmosphere, preventing surface rust. Aluminum is chemical resistant, easy to machine, and has a high strength to weight ratio - it weighs about one-third as much as steel. It is also a good conductor of electricity and heat, making it ideal for heat sinks, and reflects heat and light, is non-magnetic and is malleable.