Regarding Aluminium Hydroxide for filler,spec as follow:
Al(OH)3: 99.5% min.
SiO2: 0.08% max.
Fe2O3: 0.02% max.
Na2O: 0.3% max.
L.O.I.: 35% max.
PH: 7.5~9.8
Moisture: 0.5% max.
Adsorption(ml/100g): 55 max.
Whiteness:97% min.
Particle Size:D50: 1um max.
              + 200 mesh: 0%
              + 325 mesh: 0.1% max.

HENAN KINGWAY CHEMICALS CO.,LTD.