Kenya Chemical is a world-famous manufacturer, supplier, and exporter of Lab Chemicals. Our RXSOL-19-1591-500 Aluminium Ammonium Sulphate AR also known as ammonium alum or just alum, is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2. 12H2O. It is used in small amounts in a variety of niche applications.