PROPERTIES of Quartz (Fused Silica)

MECHANICAL PROPERTIES
Young Modulus : 71.7 GPa
Shear Modulus : 31 GPa
Bulk Modulus : 37 GPa
Knoop Hardness : 4.5 GPa
Modulus of Rupture : 50 MPa at 25°C
Poisson's Ratio : 0.17 at 25°C
Density : 2.20 g/cm3

THERMAL PROPERTIES
Softening Point : 1600 ± 25°C
Strain Point : 1000 ± 20°C
Annealing Point : 1100 ± 20°C
Max Service Temperature : 1150°C – continuous
: 1300°C – limited time
Specific Heat : 670 J/kg.°C
Thermal Expansion Coefficient : 5.7x10-7 cm/(cm·°C) between 20°C-320°C
Thermal Conductivity : 1.38 W/(m·°C)
Thermal Diffusion : 7.5x10-3 cm2/sec

ELECTRICAL PROPERTIES
Electrical Resistivity : 1018 Ω x m
Dielectric Strength : 250 - 400 kV/cm at 20°C
Dielectric Constant for 1 MHz : 3.75 at 20°C
Resistivity : 7 x 107ohm-cm at 350°C
Loss Factor : < 4 x 10-4
Dissipation Factor : < 4 x 10-4

OPTICAL PROPERTIES
Transmittance:
UV Fused Silica : >90% from 180nm...2.5μm (2mm thick)
IR Fused Silica : 90% from 250nm...3.5μm (2mm thick)
Refraction Index : 1.45840 at 589.3nm
Abbe Constant : 67.6