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The specific gravity of aluminum is 2.7, approximately one-third of the specific gravity of iron (7.8) or that of copper (8.9). The light weight of aluminum products offers various benefits. Because of its high specific tensile strength (strength per unit), aluminum is used in structural materials. Aluminum materials can be painted, anodized, or even coated with functional resin film. Such treatment makes it possible to manufacture highly functional products that are attractive.