Aluminum sulfate (Al₂(SO₄)₃) is an inorganic compound, a white orthorhombic crystalline powder. It is used as a precipitant for rosin glue, wax emulsion and other sizing materials in the papermaking industry, a flocculant in water treatment, and a retention agent in foam fire extinguishers. It is also a raw material for making alum and aluminum white, and a petroleum decolorizer and deodorizer.
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