Our superior, high quality silica fume products are preferred in use for cement and refractory materials.

Silicon Metal

Silica Fume

Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. One of the most beneficial uses for silica fume is in concrete. Concrete containing silica fume can have very high strength and can be very durable.

Silica fume consists primarily of amorphous (non-crystalline) silicon dioxide (SiO2). The individual particles are extremely small, approximately 1/100th the size of an average cement particle. Because of its fine particles, large surface area, and the high SiO2 content, silica fume is a very reactive pozzolan when used in concrete.

Since the 1980s, silica fume has been used extensively around the world to produce high performance concrete. Today, more than 10 million cubic metres of concrete containing silica fume is placed each year.

Product Specification

For engineering application

STC Microsilica®
Mandatory chemical and physical requirements Grade
E900 E940
SiO2(%) > 85 > 90
CaO(%) < 1.0 < 1.0
Na2O+K2O(%) < 2.0 < 2.0
Moisture(%) < 3.0 < 3.0
Loss on Ignition @ 950°C(LOI)(%) < 6.0 < 4.0
Retained on 45 micron sieve (%) < 10.0 < 10.0
Pozz. Activity Index (%) – 7 days > 105 > 105
Specific Surface Area(m2/g) > 15 > 15
Bulk Density(kg/m3)-densified 550 - 700 550 - 700

 

For refractory material application

STC Microsilica®
Mandatory chemical and physical requirements Grade
R940 R970
SiO2(%) 92 - 94 93 - 97
C(%) < 2.0 < 1.0
Fe2O3(%) < 0.6 < 0.6
Al2O3(%) < 0.6 < 0.6
CaO(%) < 0.8 < 0.6
Na2O+K2O(%) < 0.6 < 0.5
Moisture(%) < 2.0 < 2.0
Loss on Ignition @ 950°C(LOI)(%) < 3.0 < 2.0
Coarse Particles > 45μm(%) < 5.0 < 3.0
Bulk Density(kg/m3)-undensified 300 - 450 300 - 450
Fluidity(mm) Good(>120mm) Execllent(>150mm)


Supply and packaging

Our product is delivered in bulk, big-bags or small bags, either as undensified (bulk density approx. 200-300 kg/m3) or densified (bulk density 500-700 kg/m3), depending on the application.