Technical Data
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 |