SiO2 90-99%
It comes from fumes from the silicon and ferrosilicon production process.
Used in a wide variety of applications: in cement, as fillers, soil improvement, oil field, plastic fillers etc. Produced at all Elkem Si and FeSi plants.
Silica fume powder products are designed for Portland cement based concrete, mortar and grout mixtures. Improves the performance of concrete and mortar formulations. It acts physically to optimise particle packing of the concrete or mortar mixture and chemically as a highly reactive pozzolan.
The SilRef project plans to produce 3 microsilica reference materials with 13 certified parameters!