... elastomeric, polymer, refractory, ceramic and rubber applications. HS No.: 28112200 China Origin, microsilica meets the requirements of ASTM ... C-1240. Microsilica CAS #: 69012-64-22. Main functionVery low permeability to chloride ... microsilica meets the requirements of ASTM C-1240. Microsilica CAS No.: 69012-64-2Microsilica Packing: 900kg/jumbo bags and 300 ...