Regarding Aluminium Hydroxide for filler,spec as follow: Al(OH)3: 99.6% min. SiO2: 0.05% max. Fe2O3: 0.02% max. Na2O: 0.2% max. L.O.I.: 35% max. Moisture: 0.2% max. PH: 7.5~10 Whiteness:95% min. Particle Size:D50: 13~18um +325mesh: 35% max. + 60 mesh: 0% max. Packing: in 25 kgs bags.