Micro-silica SF97 samples 1.Silica fume 85%-97% 2.Good fluidity 3.Low permeability 4.Meets the requirements of ASTM C-124 Micro-silica SF97 samples 1. InstructionMicrosilica , also called silica fume or micro silica, is a byproduct of producing silicon metal or ferrosilicon alloys. Silicon metal and alloys are produced in electric furnaces. The raw materials are quartz, coal, and woodchips. The ...