1.Purity: Al2O3 15.8% , 17% 2.Apparence:white flakes,lump or powder 3.Best quality, favorable price 4.Prompt delivery Specifications Al2(SO4)317% or 15.8-16% ISO 9001-2000 certified Properties: It is white or grey flake,particle or massive crystallization. Apt to cake after moisture absorption when laid in air for a long time. A little green because of Fe2+ ,yellow when Fe2+ is oxided to Fe3+. ...