Silica Flour is made by grinding pure silica sand to a very fine powder. It is used as a cheap filler in plaster and some plastics to add strength or just to reduce the amount of expensive resin needed to fill a mould.
Typical Chemical Analysis :
SiO2 - >99%
CaO - 0.50%
MgO - 0.50%
Fe2O3 - 0.10%max.
Al2O3 - 0.50%
LOI - 0.50%
VM @ 105'C - 5.0%max.
For Construction - increase concrete strength, great application for bridge construction
For Refractory Manufacturing - improve liquidity and density of refractory bricks, enhance strength
Other Applications : Ceramics, Cables, Glass Rubber,etc.