... system,baking finish system ,WB waterborne system,leather sys SA-230 chemical additive : CAS No.112926-00-8Purity99.3%Place of ... ) SiO2 content: 99.3% min. b) Oil absorption (g/100g):230-250c) Average particle size: centrifugal measure: 5-5.5 micrond ... milled or tri-roller milled for a long time. SA-230 chemical additive