Specification

Paint Coating System
Corrosion Resistance

The improved corrosion resistance of 55% Zn-Al alloy coated steel coil is derived from the unique combination of the barrier protection of aluminum and the sacrificial protection of zinc. The formation of an insoluble aluminum oxide layer provides the barrier protection while zinc provides a sacrificial protection at cut edges, scratches and areas of coating damage.

Outdoor exposure testing of 55% Zn-Al alloy-coated steel coils has been conducted for over 20 years in various atmospheric environments. This testing also demonstrated a superior cut edge protection of 55% Zn-Al alloy-coated steel sheet than the galvanized steel sheet.

Heat Transmission & Reflectivity

55% Zn-Al alloy-coated steel sheet demonstrates better resistance to high temperature than the galvanized steel sheet.55% Zn-Al alloy-coated steel sheet can be used in temperatures up to 315’C.

55% Zn-Al alloy-coated steel coil has a high reflectivity value making it an effective barrier against heat.

Substantial noise reduction can be achieved by using a recommended insulation under Zn-Al steel roofing. This damps down rain induced vibration and thereby reduce noise. Also it increases the heat resistant qualities of Zn-Al roofing.

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