aluminum sulfate Aluminium oxide(fire Al2O3): 17%min Insoluble matter: 0.1% max Fe2O3(As Fe) :0.005% aluminum sulfateSpecifications: ContentHigh-classFirst-classUp to standardAl2O3 %17.0015.8015.60Fe %0.0050.0050.01As %0.0050.0050.005Water insoluble matter %0.100.100.20PH value3.03.03.0Size15mm15mm15mm Application:mainly used for making paper, printing, tannage, fire apparatus, water treatment, ...