What does the aluminum code number 1100 signify?

The aluminum code number 1100 signifies 99% commercially pure aluminum. This designation indicates that the aluminum contains a minimum of 99% aluminum by weight, making it one of the purest forms of aluminum available. This level of purity provides specific characteristics such as excellent corrosion resistance, high thermal and electrical conductivity, and good formability.

The use of the four-digit code system for aluminum alloys is standardized, where the first digit indicates the series and subsequent digits provide further details about its composition and properties. In this case, the "1" series indicates that it is a non-heat-treatable alloy primarily composed of aluminum. The remaining digits, "100," indicate the specific alloy within this series, which is known for its high purity.

Understanding the significance of aluminum alloy composition is crucial in selecting materials for various applications, where properties like conductivity and resistance to corrosion may be critical.