Fused Silica is high-purity quartz sand that has been melted to form glass.
High volume stability, low volumetric expansion and high-purity make used silica a very useful and versatile material for refractory applications, whether in aluminum launders or other highly cyclical applications.
Our fused silica, Teco-Sil® has an extremely low thermal expansion coefficient, consistent chemistry and carefully controlled particle size distribution. Teco-Sil fused silica products are specially engineered grains and powders designed for use in foundry, refractory, investment casting and other special applications.
Teco-Sil is produced at Imerys Greeneville fusion plant in Tennessee, USA.
Fused silica is an extremely insulative material with a very low thermal conductivity and with its good thermal shock resistancen it is often used in flow control/continuous casting applications (for steel making) and glass rolls.
For standard grades:
In investment casting, Teco-Sil is used for its volume stability indeed fused silica has an extremely low thermal expansion coefficient and so very tight tolerance castings can be produced with easy shell removal.