Request Fused Silica Wafers for High-Temperature Applications
Whether you're researching the strain point of fused silica, designing high-temperature optical systems, or fabricating semiconductor devices, UniversityWafer offers high-quality fused silica wafers and substrates for research and development.
Our fused silica products are frequently used in:
- Laser optics and photonics
- Semiconductor processing
- MEMS fabrication
- High-temperature vacuum systems
- Optical windows and viewports
- UV and IR spectroscopy
- Scientific instrumentation
Request a fast quotation for standard or custom fused silica substrates. Be sure to include your preferred dimensions, thickness, polish, edge finish, and quantity so we can recommend the best material for your application.
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Why Researchers Choose UniversityWafer
- Optical-grade fused silica substrates
- Custom diameters and wafer thicknesses
- Single-side and double-side polished options
- Fast quotations for universities and R&D labs
- Worldwide shipping with expert technical support
What is the Strain Point of Fused Silica?
The strain point of fused silica is the temperature below which permanent internal stresses become locked into the material. Once cooled below this temperature, the glass becomes too rigid for stress to relax naturally. Understanding the strain point is essential when designing high-temperature optical components, semiconductor substrates, precision windows, and laboratory equipment that must maintain dimensional stability during repeated heating and cooling cycles.
Typical Thermal Properties of Fused Silica
Fused silica is valued for its exceptional thermal stability and extremely low coefficient of thermal expansion. Compared to conventional optical glasses, it resists thermal shock while maintaining excellent optical transmission from the ultraviolet through the infrared spectrum.
| Property | Typical Value |
|---|---|
| Strain Point | ~1,070°C |
| Annealing Point | ~1,140°C |
| Softening Point | ~1,660°C |
| Coefficient of Thermal Expansion | ≈0.55 × 10⁻⁶/°C |
| Maximum Continuous Service Temperature | ~1,000°C |
Why the Strain Point Matters
Manufacturers carefully control cooling rates as fused silica passes through its annealing and strain points. Improper cooling can introduce residual stress that may reduce optical performance or increase the likelihood of cracking during thermal cycling. Precision annealing minimizes these stresses and improves dimensional stability for demanding research applications.
Because fused silica has such a low thermal expansion coefficient, it experiences significantly less thermal distortion than most engineering glasses. This makes it a preferred substrate material for:
- Semiconductor wafer processing
- Laser optics and high-power laser systems
- MEMS fabrication
- Photolithography equipment
- Vacuum chamber viewports
- UV optical components
- High-temperature laboratory fixtures
Effects of Thermal Annealing
Research has shown that thermal annealing can significantly reduce surface defects and laser damage precursors on fused silica. Controlled heat treatment improves optical performance by relieving residual stress and reducing microscopic imperfections introduced during polishing or fabrication.
Annealing is particularly important for optical-grade fused silica used in high-energy laser applications, where even small surface defects may lower the laser-induced damage threshold.
Fused Silica for Research and Manufacturing
UniversityWafer supplies fused silica wafers and substrates for universities, national laboratories, and commercial R&D facilities. Available options include polished wafers, optical windows, custom diameters, thin substrates, and precision-finished fused silica suitable for semiconductor processing, optics, photonics, and scientific instrumentation.
Whether your project requires excellent thermal shock resistance, low thermal expansion, or exceptional optical clarity, fused silica remains one of the most versatile materials available for high-temperature research applications.