MIL-PRF-8625 is a military specification that outlines the requirements and standards for the anodizing of aluminum and aluminum alloys. Anodizing is an electrochemical process that creates a protective oxide layer on the surface of aluminum, improving its corrosion resistance and durability. MIL-PRF-8625 lists the different types, classes, and performance standards for anodizing processes used in aerospace and military applications. This is done to make sure that the quality and performance of anodized aluminum parts are always the same.