1superfine white powder 2 silica for resin,plastic, PMMA, PS 3 purity min98% 4 best price 5 ... good quality precipitated silica for resin, plasticmolecular formula SiO2SPEC as below ItemvalueBET m2/g (Specific surface ... μm water wash sieve residue %≤0.05Na2SO4 content%≤0.5Application ----resin, plastic, PMMA, PSAdvantage -------It can improve the intensity, toughness ,abrasion ...