Aluminum Potassium Sulphate FCC, as the name implies, is a chemical compound that comprises potassium, aluminium and sulphate ions. The ratio is mainly 1:1:2. This metal sulphate also acts as an aluminium salt, a potassium salt, a flame retardant, and an astringent. It is a food grade chemical compound that is used in baking powder as an additive. It is applicable in food, beverage and nutritional supplements. This white crystalline powder is water soluble and insoluble in alcohol.