1,our silica fume meet the standard ASTM-C1240, 3have independent right of import and export we have our own factory in XiamenWe can offer the silica fume depend on your requestbenefits of microsilica in concrete1.stability2.spend less time for hardened concrete3.reduce heat4.chloride resistance5.corrosion protection6.abrasion resistance7.sulfate resistance8.ASR-protection9.chemical attack ...