... gravity is 1.69 , easy to absorb moisture and agglomeration in the air for a long time .Dehydration temperature is 86 ... .5 degrees Celsius, can dissolve in water, acid and alkali, insoluble in alcohol, the aqueous solution is acidulous Uses ... Iron-free aluminium sulphate ITEM SPECIFICATION RESULTAluminum oxide Al2O3 %, min 17.0017.15Iron (Fe) content %, max 0.0050.0045Water insoluble matter ...