Galvalume sheet
The galvalume coating is an alloy consisting of approximately 55% aluminum, 43.4% zinc and 1.5% silicon by weight, which is applied to steel by the continuous hot dip process. Galvalume steel sheet offers the best qualities of aluminum coated (aluminized) and zinc coated steel sheet ...
Galvalume steel sheet offers the best qualities of aluminum coated (aluminized) and zinc coated steel sheet (galvanized). The aluminum/zinc coating has barrier corrosion resistance and heat resistance similar to aluminum coated steel. It also has good bare edge galvanic protection and forming qualities similar to continuously annealed commercial quality galvanized.
The appearance of Galvalume coating is quite distinctive. Its smooth, flat and fine spangle and a silvery metallic appearance make it attractive in unpainted applications.
Basic Use: Galvalume sheet -- bare, acrylic-coated and prepainted -- is intended for applications where superior
corrosion resistance is required, as in roofing, siding, pre-engineered buildings, appliances, air conditioner housings
and other uses. Bare Galvalume sheet is also used for applications where resistance to oxidation at elevated
temperatures is important, such as fireplaces, toasters and automotive exhaust systems.
Appearance: Uniform visual appearance of unpainted Galvalume sheet cannot be guaranteed. Even with Galvalume
Plus, the normally occurring variations in surface appearance typical of all hot-dip products will still be present and
will not be masked by the thin, clear acrylic film. If uniform visual appearance is critical, then prepainted Galvalume sheet should be ordered.
Paintability: Prepainted Galvalume sheet is an ideal product for many applications where the aesthetic appearance of
a painted product is desired along with excellent atmospheric corrosion resistance. Such applications include preengineered metal buildings, architectural panels, roofing and siding, and other building components. Galvalume sheet
may be fieldpainted with most paints suitable for galvanized: zinc-dust primers, butyral wash primers and acrylic latex
paints. Galvalume Plus may be field painted using water-based acrylic primers and/or topcoats.