... for your reference17% Iron-free aluminium sulphate ITEM SPECIFICATION RESULTAluminum oxide Al2O3 %, min 17.0017.15Iron (Fe) content %, max 0.0050.0045Water ... matter %, max 0.200.10PH value 1% aqueous solution, min 3.03.3As %, max 0.00050.00008Heavy metals as Pb ... ITEM STANDARDRESULTAverage Size Of Flake, max 0-15mm Conformed Aluminum oxide Al2O3 %, min 15.80 over16.5-17%Iron (Fe) content %, max ...