... the air for a long time .Dehydration temperature is 86.5 degrees Celsius, can dissolve in water, acid and alkali, ... sulphate ITEM SPECIFICATION RESULTAluminum oxide Al2O3 %, min 17.0017.15Iron (Fe) content %, max 0.0050.0045Water insoluble matter %, max 0.200.10PH ... -15mm Conformed Aluminum oxide Al2O3 %, min 15.80 over16.5-17%Iron (Fe) content %, max 0.01 about0.005Water insoluble matter %, max 0 ...