Potash Alum, Potassium alum or Potassium Aluminum Sulfate is a chemical compound (the potassium double sulfate of aluminium) of Potassium, Aluminum and Sulphur. It is commonly found in its Dodecahydrate form as KAl(SO4)2·12H2O. It is commonly used in water purification, leather tanning, dyeing, fireproof textiles, and baking powder. It also has cosmetic uses as a deodorant, as an aftershave treatment and as a styptic for minor bleeding from shaving.
Density 1.75 g/cm3 (20 °C)
Melting Point 92.5 °C
pH value 3.0 - 3.5 (100 g/l, H2O, 20 °C)
Bulk density 900 kg/m3
Solubility 139 g/l
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