by-product-raw materials from Silicon metal.would like to accept to SGS. LOI <4% PAI >=130% H2O<3% CL<0.05

Microsilica (Silica fume) used in concrete and refractory.

it can be improve concrete's properties such as compressive strength, bond strength and abrasion resistance, reduces permeability, and therefore helps in protecting reinforcing steel from coorrosion.

at the same time, Microsilica can be used in the production of refractory and porcelain  to raise intensity and durability, it also can be used in paint,coating,resin,rubber and other high molecular as a filler material to improve the material overrall performance

Grey microsilica