Molecular formula: AL ( OH) 3 Molecular weight: 78 Relative density: 2.42 Melting point: 300 o C ( absence of crystal water) Properties: It’ s inorganic salt. It’ s white crystal powder. It’ s insolvable in water and alcohol and soluble in inorganic acid and caustic soda. Application: In chemical industry, it’ s used in baking alumina and it’ s the raw material of aluminum salt, enamel, ceramic, glassware and lubricant. It can also be used in rubber, plastic, medicine, fire retardant, paper padding etc.