| | Al2O3 content 17-18% . Soluble in water, insoluble in alcohol and stable in air. Appearance of alum is white and grayish lump, granular and powder. It is used for coagulant in pulp and paper mills, water purification plants, drinking water treatment, leather tanning textiles, in fire retardant, deodorizer, firming agent in foods and pharmaceuticals, flocculant, activation of silica for water treatment, sizing paper, lakes, dyeing mordant, foaming agent in fire-fighting foams, fireproofing cloth, catalyst for methane mfg, pH control for paper, and waterproofing concrete | | |
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