Ferric Alum : (Aluminum Sulphate) Chemical Formula Al2 (SO4)3 18H20 Packing : 25 Kgs & 50 Kgs HDPE Laminated bags with thick inner liner. Physical Property : Slight yellowish lumps. Chemical Property : Water insoluble 2% max. Iron compound 0.5% max. Aluminum contents as Al203 15 to 16%, pH of 5% solution 2 to 2.5