... 2.SGS certification 3.Free sample Iron free aluminum sulfate 17% Molecular Formula:AL2(SQ4)3·XH2OProperties:Iron-free aluminum ... Iron-free aluminium sulphate ITEM SPECIFICATION RESULTAluminum oxide Al2O3 %, min 17.0017.15Iron (Fe) content %, max 0.0050.0045Water insoluble matter ... -15mm Conformed Aluminum oxide Al2O3 %, min 15.80 over16.5-17%Iron (Fe) content %, max 0.01 about0.005Water insoluble ...