fused silica

About fused silica

Fused silica is a highpurity, amorphous form of silicon dioxide engineered for demanding hightemperature and precision applications. Produced by electrically fusing selected quartz and rapidly cooling the melt, it offers extremely low thermal expansion, excellent thermal shock resistance, high softening point and outstanding chemical inertness compared with conventional silica sand or glass.

Because of this unique property profile, fused silica is widely used in investment casting shells, precision foundry refractories, kiln furniture, slide gates, hightemperature linings, as well as in specialty glass, optics, semiconductor, photovoltaic and fibreoptic components where dimensional stability, purity and low thermal distortion are critica

Fused silica is used wherever very low thermal expansion, high purity and thermal shock resistance are required.

Hightemperature & refractories

• Investment casting shells and cores for precision castings (steel, superalloys, turbine parts).

• Refractory shapes, gunning mixes, kiln furniture, ladle and tundish linings, slide gates and burner blocks in steel and glass industries.

Glass, optics & photonics

• Optical windows, lenses, prisms and wafers for UV to IR applications (lasers, lithography, sensors).

• Semiconductor and photovoltaic components, crucibles and tubes requiring very low thermal expansion and high purity.

Industrial powders & fillers

• Fused silica powder as a lowexpansion filler in epoxy encapsulants, electronic packaging, potting compounds and engineering plastics to reduce CTE and improve dimensional stability.

Unmatched Thermal and Chemical Stability

Fused silica exhibits low thermal expansion, excellent thermal shock resistance, and superb acid resistance, except against hydrofluoric acid. Its stability under high temperatures and harsh chemicals ensures longevity and reliability, making it a preferred material for critical high-temperature and high-purity applications.


Optimal Transparency & Purity for Optical Precision

With over 99.8% SiO2 content and transparency exceeding 90% in the visible range, clear fused silica is indispensable for optical windows, lenses, and precision instrumentation. Its consistent refractive index and low impurity levels guarantee exceptional visual clarity and performance.


Versatile Formats to Suit Every Need

Fused silica is available in various customizable shapes including sheets, tubes, rods, and other specialized forms. Its consistent density, ultra-low porosity, and smooth vitrified surface finish cater to a wide range of industrial and laboratory uses.