Undensified Silica Fume, also known as raw silica fume or primary silica fume, it is chemically similar to densified silica fume, but a different density.This type of silica fume is incredibly light, has a density of 250-400 kg/m3, is very active, and requires a large storage space.

Undensified silica fume is more convenient to use, because of the characteristics of small particles, easy to disperse, basically do not need to increase the concrete mixing time. It has the characteristics of increasing the compressive and flexural strength of concrete, water penetration resistance, good filling effect and good adaptability to water reducing agents. The color of as-built silica fume will be lighter than that of densified silica fume, so it will not deepen the color of concrete.

Undensified Silica Fume Applications

Refractories. Silica fume is commonly used in castable, sintered, and fused refractories. For example, it can be used in high-performance, high-grade, and low-cement refractory castables and prefabricated parts, air permeable bricks, large-scale iron trenches and ladles, and more.

Mortar and concrete. Silica fume can also be used for harbour wharfs, high-rise buildings, railway bridges, reservoir dams, concrete pavement, and more.

Protective coatings. Nano-silica sol serves as an active material for fire protection, environmental protection, and anticorrosive coating.

Wall and decorative materials. Silica fume can also be used for thermal insulation mortar, polymer mortar, and as an interface agent for wall insulation.

Putty. Microsilica can be used in putty powder for exterior and interior wall insulation.

Filling and reinforcement. It is also used as filling and reinforcing materials in resin, rubber, paint, unsaturated polyester, and more.

Additives. Finally, silica fume is commonly used as an additive in other active areas.

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