Technical SpecificationsPre-Painted Alu-Zinc Steel Sheets (Galvalume*): (55% Aluminium, 43% Zinc, 1.5% Silicon) Aluminium - Zinc Alloy coating gives corrosion resistance and superior heat reflectivity, Galvalume Steel reflects a high percentage of heat and can withstand in any weather conditions, without surface discoloration. It is also suited for coastal areas. Bare Galvalume coating is inorganic and does not contain volatile compounds that can harm the environment.