We offer condensed microsilica (also called silica fume),namely, amorphous powdery silicon dioxide, widely used as an additive to high-class concrete, super strong cement and fire-resistant material as well. The material is collected from the silicon steam which is expelled from the flue and is oxidized into silicon dioxide when melting the ferroalloy. Microsilica is collected in our partner factories by adopting the most up-to-date and environmentally friendly designed treatment system.The concrete and the cement blended with a satisfactory ratio of microsilica can be mainly used in the constrction of dams,reservoirs, power stations,seaport docks,airfield runways, tunnels, xxxxx