Galvalume steel

1. Strong Corrosion Resistance: GL steel is more resistant than galvanised (GI) steel due to the double protection of zinc and aluminium. That is, when the zinc is worn away, the aluminium will form a dense layer of aluminium oxide, preventing corrosive substances from further corroding the steel interior. This also means it has a “self-healing” ability.

Attractive Appearance: Galvalume has a silvery-white colour and smooth surface. And there are many delicate “zinc flowers” that are highly appreciated when used as a building material.

Heat Resistance: It has a good heat resistance and can withstand high temperatures of more than 300°C. Its thermal reflectivity is also very high, twice that of galvanized steel, thus it is often used as a thermal insulation material.

Paintability: Due to the good adhesion between galvalume steel coating and paintings, it can be painted directly without any pretreatment and weathering. Like hot-dipped galvanized steel, it has good workability and weldability, and can accommodate cold bending, stamping, etc., without doing damage to steel surface.

Long Service Life: Tests conducted under the same outdoor conditions show that the service life of galvalume steel is more than two times that of galvanized steel. Research conducted by the Metal Construction Association (MCA) indicates that galvalume steel can be expected to provide at least twice the service life of traditional zinc-coated steel under the same exposure conditions. It means galvalume steel could last 50 ~ 60+ years before the corrosion begins to show.