What Is Quartz Glass? Composition, Properties & Industrial Applications
What Is Quartz Glass? Composition, Properties & Industrial Applications
1. Introduction Quartz glass, also widely known as fused quartz or fused silica glass, is a premium industrial amorphous material dominated by ultra-high purity silicon dioxide (SiO₂). Distinguished from conventional soda-lime glass and crystalline natural quartz, it delivers outstanding performance under extreme high temperature, strong chemical corrosion and full-spectrum light transmission environments. It has become an irreplaceable core material for semiconductors, precision optics, laboratories and high-temperature industrial furnaces worldwide. This guide covers its basic composition, inherent advantages and mainstream usage scenarios for engineers, procurement specialists and technical researchers. 2. What Is Quartz Glass Quartz glass is manufactured by melting high-purity quartz raw materials at 1700°C to 2000°C and forming into solid glass. Its main component reaches 99.5% ~ 99.999% SiO₂, with almost no additional chemical additives. Different from crystalline quartz with regular molecular arrangement, quartz glass features a short-range ordered and long-range disordered internal structure. This special structure brings isotropic physical and chemical properties, so performance will not vary with direction. Main categories by form and purity: - Transparent quartz glass: Optical grade & semiconductor grade, for precision light transmission and ultra-clean processes - Opaque quartz glass: General industrial grade, mainly used for heat preservation and common high-temperature equipment - Synthetic fused silica: Ultra-high purity grade for lithography and aerospace ultra-precision components 3. Key Properties
| Performance Index | Technical Data |
|---|---|
| Main Component | 99.5% ~ 99.999% SiO₂ |
| Continuous Working Temperature | Up to 1100°C |
| Softening Point | 1730°C |
| Thermal Expansion Coefficient | 5.4×10⁻⁷ /°C |
| Chemical Resistance | Resist most acids & organic solvents, vulnerable to hydrofluoric acid |
| Spectral Transmittance | 160nm ~ 2500nm full band transmission |
| Electrical Insulation | Excellent at high temperature & high frequency |
Core property summary: Ultra-low thermal expansion, superior thermal shock resistance, full-spectrum optical transmittance, extreme chemical inertness and high electrical insulation.
4. Manufacturing Process The production of quartz glass strictly follows raw material purification → high-temperature melting → molding → annealing → finishing → quality inspection. Raw materials are fully washed and calcined to remove metal impurities, then melted in high-temperature furnaces. After forming, finished products go through gradual cooling annealing to eliminate internal stress, avoiding cracking during service. 5. Core Advantages - **Extreme temperature resistance**: Operate stably for long hours under 1100°C, resist rapid heating and cooling - **Ultra-high purity**: Low metal impurity content, no contamination for semiconductor wafer production - **Outstanding optical performance**: Transmit ultraviolet, visible and near-infrared light without absorption dead zones - **Excellent chemical stability**: Hardly react with common acids, alkalis and organic reagents - **Long service life**: Stable structure under cyclic working conditions, low failure rate 6. Application Scenarios - Semiconductor industry: Diffusion furnace tubes, wafer carriers, annealing components - Optical industry: UV optical windows, spectrometers, optical lens substrates - Laboratory & chemical industry: High-temperature reaction vessels, corrosion-resistant experimental utensils - UV equipment: UV sterilization lamps, UV curing system tubes - Aerospace & defense: High-temperature observation windows, precision structural parts 7. Material Comparison (Quartz Glass vs Ordinary Glass) Ordinary glass takes silica, soda ash and limestone as raw materials, with many auxiliary components. Its maximum working temperature is below 400°C, poor in UV transmittance and chemical resistance. Quartz glass is nearly pure SiO₂, working temperature over 1000°C, full UV transmission and strong corrosion resistance. It is far superior to ordinary glass for industrial high-end applications.
8. FAQ
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9. Conclusion
Quartz glass stands out among industrial glass materials relying on ultra-high purity, excellent thermal stability and chemical inertness. Whether for semiconductor manufacturing, optical systems or laboratory use, it is the preferred solution for extreme working conditions.
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**Author**: Felix Glass Optical Engineering Team
**Reviewed By**: Senior Optical Material Engineer
**Last Updated**: June 2026
**References**: ISO 12123 Optical Glass Standards, Semiconductor Quartz Material Specification
