... .htmlCAS NO.: 21645-51-2FORMULA: Al(OH)3MOL WT.: 78 H.S. CODE: 2818.30 SYNONYMS Hydrated alumina; Alumina hydrate; Alumina trihydrate ... aluminum trihydroxide, Al(OH)3. It is a non-abrasive powder with a Mohs' hardness index of 2.5 - 3.5 ... Filler, etc,spec:H-WF-90,H-WF-75,H-WF-50sp,H-WF-25,H-WF-20,H-WF-14,H-WF-10,H-WF-1ALUMINIUM HYDROXIDE ...