Aluminum castings are primarily made from aluminum alloys, which are a combination of aluminum with other elements. The choice of alloy composition depends on the specific application requirements and desired properties. Common elements added to aluminum alloys include silicon, copper, magnesium, zinc, and others.

Aluminum is a lightweight metal, making aluminum castings ideal for applications where weight reduction is critical. This characteristic is particularly beneficial in the automotive, aerospace, and transportation industries.

Aluminum naturally forms a thin, protective oxide layer on its surface, which provides excellent corrosion resistance. This property makes aluminum castings suitable for outdoor and marine applications. Aluminum is a ductile metal, meaning it can be formed and shaped into various complex designs using different casting methods.