... 99%, White content purity min 88%, Industrial Grade, PH value:6-8 About us : Qingdao ... seaside city ,which engages in the manufacturing and marketing of Sodium sulfate , Cryolite , Soda ash , Edible ... sulfateand Sodium Tripolyphosphate . And our products mainly export to North America,Asia and Europe .Our factory ... , %<0.100.30whiteness, % min8680 The specification of Sodium Sulphate Anhyrous99%