DUST Silica Fume(Microsilica) contains 85% to 96% silicon dioxide

DUST Silica Fume is a supplementary cementitious material, comprising of amorphous silica produced by electric arc furnaces

The most common use of silica fume is in the production of concrete in which its compressive strength, bond strength and abrasive resistance improve the properties of the concrete. As the particle sizes are 1/100th the size of a normal cement particle, the compressive strength of the cement is increased resulting in high-strength concrete capable of a compressive strength of over 15,000psi - useful in supporting high rise building structures.

Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide. Due to its fine particles, large surface area, and the high silicon dioxode content, silica fume is a very reactive "pozzolan" (forms cementitious properties when mixed with water and calcium hydroxide) when used in concrete.