TECO-SIL® for refractories

TECO-SIL products are fused silica grains and powders for use in foundry, refractory, investment casting and other special applications.


High purity fused silica

Our TECO-SIL fused silica products are specially engineered grains and powders designed for use in the foundry, refractory, investment casting and other special applications. They are produced in Greeneville, Tennessee, USA. 

It’s high volume stability, extremely low thermal expansion coefficient, high purity, consistent chemistry and carefully controlled particle size distribution make Teco-Sil fused silica a useful and versatile material for refractory applications, whether in aluminium launders or other highly cyclical applications. This extremely low thermal expansion coefficient is why it is a preferred material for fast shell building, guaranteeing better coverage of edges and cavities to minimize shell cracking. It also reduces sedimentation in the slurry tank, which is why it is widely used in the investment casting process to achieve high volume stability and easy shell removal. 

Teco-Sil fused silica is also an extremely insulative material with very low thermal conductivity and with its excellent thermal shock resistance, meaning it is often used in glass rolls, coke ovens.

Key benefits

Outstanding and consistent chemistry, (minimal impurities, resulting in excellent hot strength)
Low thermal conductivity, yielding an insulative mold/controlled cooling
Virtually zero crystalline silica content
Excellent volume stability, resulting in near net shape castings
Extremely low coefficient of thermal expansion
Carefully controlled particle size distribution
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