Technical Specifications
Comprehensive material properties and performance data for 99.99% purity quartz glass. Engineered for precision and reliability in the most demanding applications across semiconductor, optical, and high-temperature industries.
Material Properties Overview
Physical & Mechanical Properties
Quartz glass exhibits superior mechanical strength and dimensional stability. The low density combined with high hardness makes it ideal for precision components requiring minimal weight and maximum durability.
| Mohs Hardness | 5.5 – 6.5 |
| Compressive Strength | 1100 MPa |
| Flexural Strength (20°C) | 67 MPa |
| Tensile Strength | 48 MPa |
| Young’s Modulus (20°C) | 72 GPa |
| Shear Modulus | 31 GPa |
| Bulk Modulus | 37 GPa |
| Poisson’s Ratio | 0.17 |
| Density (20°C) | 2.2 g/cm³ |
Thermal Properties
Exceptional thermal shock resistance and low thermal expansion make quartz glass ideal for rapid temperature cycling applications. Can withstand temperature changes from 1100°C to room temperature without cracking.
| Annealing Point | ≈ 1215 °C |
| Strain Point | ≈ 1120 °C |
| Max. Working Temp (Continuous) | 1200 °C |
| Max. Working Temp (Short Term) | 1300 °C |
| Thermal Expansion (20-300°C) | 5.5 × 10⁻⁷ /°C |
| Thermal Conductivity (20°C) | 1.4 W/(m·K) |
| Specific Heat (20°C) | 670 J/(kg·K) |
| Thermal Diffusivity (20°C) | 9.5 × 10⁻⁷ m²/s |
| Softening Point | ≈ 1680 °C |
Electrical Properties
Excellent electrical insulation properties with high resistivity and low dielectric loss. Ideal for high-frequency applications and electrical isolation in semiconductor processing equipment.
| Resistivity (at 20°C) | > 10¹⁸ Ω·cm |
| Resistivity (at 350°C) | 7 × 10⁷ Ω·cm |
| Dielectric Constant (1 MHz, 20°C) | 3.75 |
| Dielectric Strength | 25 – 40 kV/mm |
| Dielectric Loss Factor (1 MHz) | < 1 × 10⁻⁴ |
| Dielectric Loss Factor (1 GHz) | < 6 × 10⁻⁴ |
Optical Properties
Excellent UV transmission and optical clarity make quartz glass essential for spectroscopy, laser systems, and optical fiber applications. High purity ensures minimal absorption and scattering.
| Refractive Index (589 nm, 20°C) | 1.4585 |
| Refractive Index (1060 nm) | 1.4496 |
| Transmission Range | 185 – 2500 nm |
| UV Transmission (254 nm, 10mm) | > 90% |
| Abbe Number | 67.8 |
| Stress Optical Coefficient | 3.5 × 10⁻⁶ MPa⁻¹ |
Chemical Composition & Purity
Ultra-high purity with minimal metallic impurities ensures contamination-free processing in semiconductor and optical applications. Verified by ICP-MS analysis for every production batch.
| SiO₂ Content | ≥ 99.99% |
| OH Content | < 10 ppm |
| Al Impurity | < 10 ppm |
| Fe Impurity | < 5 ppm |
| Na + K Impurities | < 5 ppm |
| Total Metal Impurities | < 20 ppm |
| Acid Resistance | Excellent |
Additional Properties
Comprehensive material characteristics covering acoustic, radiation, and surface properties essential for specialized applications in research and industrial processes.
| Acoustic Velocity (Longitudinal) | 5968 m/s |
| Acoustic Velocity (Transverse) | 3764 m/s |
| Radiation Resistance | Good |
| Permeability (He at 700°C) | Low |
| Surface Energy | ≈ 300 mJ/m² |
| Outgassing Rate (Vacuum) | Very Low |
Performance Comparison
Understanding how quartz glass compares to other materials helps in selecting the optimal solution for your application. Below is a comparison with common alternative materials.
| Property | Quartz Glass | Borosilicate Glass | Sapphire | Alumina Ceramic |
|---|---|---|---|---|
| Max Temperature (°C) | 1200 | 500 | 1800 | 1600 |
| Thermal Expansion (×10⁻⁶/K) | 0.55 | 3.3 | 5.3 | 7.2 |
| Thermal Shock Resistance | Excellent | Good | Fair | Fair |
| UV Transmission | Excellent | Poor | Good | None |
| Chemical Purity (%) | 99.99 | ~98 | 99.99 | 99.5 |
| Relative Cost | Medium | Low | Very High | Medium |