... 99% white crystalline powder FOB WUHAN : 90USD PER TON sodium sulfate,anhydrous Na2SO4 99%white crystalline powderFOB WUHAN : 90USD PER ... pure alkali. In chemical industry, it used to make sodium sulfate, sodium silicate and other chemical raw material. In weaving industry, ... bag, the thickness ≥0.05mm. There are "food additives Sodium metabisulfite" printed on the external packing, with the sign of ...