Fused Quartz - Typical Properties of Clear Fused Silica

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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