1. Outline of Weather Resistant Alstar
As shown in Table-1 compositions of coating baths, there are two types of hot dip aluminum steel sheet, "Pure aluminum type" and "Aluminum-Silicon alloy type".
Weather Resistant Alstar (hereinafter called W.R.Alstar) is "Al-Si alloy type".
Both compositions have almost equal corrosion resistance properties. W.R.Alstar has better corrosion resistance properties than hot dipped galvanized steel sheet (hereinafter called Galvanized) and hot dipped 55% Aluminum-Zinc alloy coated steel sheet (hereinafter called 55% Al-Zn) and thus is ideal for roofing and outer cladding applications.

Table -1. Compositions of Coating Baths