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Aluminum added aluminum metal elements synthetic materials have been widely used in the construction industry on various aspects. Aluminum low density, but the intensity is relatively high, close to or more than high quality steel, plastic, can be processed into a variety of profiles, with excellent electrical conductivity, thermal conductivity and corrosion restance, widely used in industry, usage after the steel. 1884 libel use as a building material in the United States since Washington Monument spire.