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Micro silica 85%-98% is a very fine pozzolanic material, as a byproduct of the production of silica metal or ferro silicon. Micro silica 85%-98%SiO2: 85%-98% LOI: 2%MAXPozzolan Activity: 120 minBulk Density: 250-650kg/m3 We, Xiamen Yu Lin S&T Co.,Ltd are the manufacturer of Concrete micro silica or Silica Fume and silicon metal and we sincerely hope we can have a good chance to work with your ...