... 0050.0045Water insoluble matter %,max0.200.10PH value 1% aqueous solution,min3.03.3As %,max0.00050.00008Heavy metals as Pb %, ... 86.5 degrees Celsius, can dissolve in water, acid and alkali, insoluble in alcohol, the aqueous solution is acidulous. 3)Category: 1---Industrial ... Insolubles: 0.15%max Grain size: 2---5mm Use: Used in papermaking, printing and dye, tanning leather, fire-fighting equipment, ...