Typical Properties of Clear Fused Silica
- Density: 2.203 g/cm3
- Hardness: 5.3–6.5 (Mohs scale), 8.8 GPa
- Tensile strength: 48.3 MPa
- Compressive strength: >1.1 GPa
- Bulk modulus: ~37 GPa
- Rigidity modulus: 31 GPa
- Young's modulus: 71.7 GPa
- Poisson's ratio: 0.17
- Lame elastic constants: λ=15.87 GPa, μ=31.26 GPa
- Coefficient of thermal expansion: 5.5×10−7/°C (average from 20 °C to 320 °C)
- Thermal conductivity: 1.3 W/(m·K)
- Specific heat capacity: 45.3 J/(mol·K)
- Softening point: c. 1665 °C
- Annealing point: c. 1140 °C
- Strain point: 1070 °C
- Electrical resistivity: >1018 Ω·m
- Dielectric constant: 3.75 at 20 °C 1 MHz
- Dielectric loss factor: less than 0.0004 at 20 °C 1 MHz
- Index of refraction: at 587.6 nm (nd): 1.4585
- Change of refractive index with temperature (0 to 700 °C): 1.28×10−5/°C (between 20 and 30 °C)
- Strain-optic coefficients: p11=0.113, p12=0.252.
- Hamaker constant: A=6.5×10-20 J.
- Dielectric strength: 250–400 kV/cm at 20 °C
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