Silica Fume NR900 is a dry powder available in two forms,densified silica fume and undensified silica fume. Silica Fume NR900 is a pozzolanic material that consists primarily of fine silicon dioxide particles in a non-crystalline form. Silica Fume NR900 meets the requirements of ASTM C-1240 and contains minimum of 90% silicon dioxide (SiO2). Technical Data: Parameters Standard Value Silicon Dioxide(SiO2) min 90 % Loss on Ignition(L.O.I) max 3 % Moisture Content(H2O ) max 1.0 % Percent Retained On 45micron (325 sieve) max 2.0 % Bulk Density 250-300kg/kg/m3 and 600-700kg/m3 Silica Fume CAS #: 69012-64-2  Silica Fume Packing: 900kg/jumbo bags,500kg/jumbo bags and 25kg small plastic woven bags.