Silica Fume NR850 is a densified dry powder microsilica admixture for portland cement concrete and mortars. Silica Fume NR850 is a pozzolanic material that consists primarily of fine silicon dioxide particles in a non-crystalline form. Silica Fume NR850 meets the requirements of ASTM C-1240 and contains a minimum of 85% silicon dioxide (SiO2). Technical Data: Parameters Standard Value Silicon Dioxide(SiO2) min 85 % Loss on Ignition(L.O.I) @ 975 degree celsius max 4 % Moisture Content max 3 % Percent Retained On 45micron (325 sieve) max 2 % Bulk Density 600-700kg/m3 Silica Fume CAS #:69012-64-2 Silica Fume Packing: 900kg/jumbo bags and 25kg small plastic woven bags.