Aluminum Hydroxide Al OH3 CAS NO. 21645-51-2 General Properties Physical and chemical properties Model Unit Test result Al2O3 % 99.53 SiO2 % 0.02 Fe2O3 % 0.01 Na2O % 0.015 Loss on ignition % 34.50 Attached water % 0.22 Mean particle diameter um 10 Whiteness % 90 PH value 8.5