1.Silicon powder (also called micro silicon powder) (scientific name "Silica Fume, Microsilica, or Silica Fume), silicon powder and silicon ash. It’s an industrial electric furnace in the process of high temperature silicon and ferrosilicon smelting industry, along with the waste gas emitted by special capture device to collect smoke. In the escape of smoke, SiO2 accounted for about 90% of the total ash content, granularity is very small, the average particle size is almost nanoscale, known as the silicon powder.
2.Scientific name "silica fume," Micro-silica or fumed silica. And it has two colors, white or black. Fumed silica can be divided into two kinds, method of precipitation and gaseous phase.

3.Micro silica fume's average granule diameter is 0.15~0.20 µm,specific surface area is 15000 ~ 20000 m2/kg, and it has extremely strong surface active.
4.It possesses optical activity, pyroelectricity, and piezoelectricity. There are usually solid, liquid, and gaseous inclusion in the crystalloid, and it contains microelement ion, Ore are usually in grey, yellow, etc.