... quality 2.competitive price 3.Big quantity 4.Refined by natural mine Na2SO4 is mainly used in synthetic detergent, vinylon, sodium ... , glass, tannage, papermaking, the anticorrosive treatment of gas pipe, metallurgy, surface treatment, filler industry, and so on.Packing & storage : Net wt ... )%≤0.350.25Fe%≤0.0020.001Moisture %≤0.200.02Whiteness %≥8290 Natural Na2SO4