- Synonyms: Alum earth, Alumina, Gooch cruciblesr- Al2O3r- M = 101,96 g/molr- CAS [1344-28-1]r- EINECS-No.: 215-691-6r- Solub. in water: (20 ºC): insolubler- Melting point: ~ 1760 ºCr- Tariff number: 2818 20 00 00r- Applications: in porcelain industry, in building materials, catalyst, synthesis of organic products.rrSPECIFICATIONSrgrain size: 0,05-0,2 mm rpH (10 %, H2O): approx. 10 rr