According to different application, TOPKEN supply different grade microsilica /silica fume recently TOPKEN research and develop white silica fume, and successfully applied to the compound fertilizer, pesticide (as adsorbent, or producting silicon fertilizer), coating, paint (as a thickener, anti-sinking agent), rubber (as reinforcing agent), plastic (as the filling agent), special porcelain, can substitute the white carbon black and reduce the cost. The main index are as follows: 

      1) White degree: ≥80%

      2) SiO₂: ≥92% 

      3) Retained on 45 μ m sieve: ≤4%

      4) Pozzolanic activity: ≥105 

      Because production of white silica fume is low, at present our company only supply end users.