Quartz Glass Properties

Typical properties of clear fused silica
The following data is copied from Wikipedia on 09.04.2012:

arrow Density: 2.203 g/cm3

arrow Hardness: 5.3–6.5 (Mohs scale) , 8.8 GPa

arrow Tensile strength: 48.3 MPa

arrow Compressive strength: >1.1 GPa

arrow Bulk modulus: ~37 GPa

arrow Rigidity modulus: 31 GPa

arrow Young's modulus: 71.7 GPa

arrow Poisson's ratio: 0.17

arrow Lame elastic constants: λ=15.87 GPa, μ=31.26 GPa

arrow Coefficient of thermal expansion: 5.5×10−7/°C (average from 20 °C to 320 °C)

arrow Thermal conductivity: 1.3 W/(m·K)

arrow Specific heat capacity: 45.3 J/(mol·K)

arrow Softening point: c. 1665 °C arrow Annealing point: c. 1140 °C

arrow Strain point: 1070 °C

arrow Electrical resistivity: >1018 Ω·m

arrow Dielectric constant: 3.75 at 20 °C 1 MHz

arrow Dielectric loss factor: less than 0.0004 at 20 °C 1 MHz

arrow Index of refraction: at 587.6 nm (nd): 1.4585

arrow Change of refractive index with temperature (0 to 700 °C): 1.28×10−5/°C (between 20 and 30 °C)[4]

arrow Strain-optic coefficients: p11=0.113, p12=0.252.

arrow Hamaker constant: A=6.5 zJ.

arrow Dielectric strength: 250–400 kV/cm at 20 °C[6]


The vision of The QUARTZ Corp is to become a major and sustainable player in the High Purity Quartz market.