... quality 2.competitive price 3.Big quantity 4.Refined by natural mine Na2SO4 is mainly used in synthetic detergent, vinylon, sodium ... silicate, bleaching, dyeing, glass, tannage, papermaking, the anticorrosive treatment of gas pipe, metallurgy, surface ... )%≤0.350.25Fe%≤0.0020.001Moisture %≤0.200.02Whiteness %≥8290 Natural Na2SO4