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Quartz glass is characterized by an extremely low coefficient of expansion 5.5 x 10-7 mm. It is at the level of 1/34 of the coefficient for copper and only 1/7 for borosilicate glass. It also shows high heat resistance for shocks, e.g. the glass may be heated to more than 1500 degrees Celsius and then submerged in water without cracking.

The glass transmits UV radiation, and its infrared transmittance ranges to circa 4 micrometers.

Basic parameters of quartz glass:

PARAMETER VALUE
Density 2.203 g/cm3
Hardness 5.3–6.5 (Mohs scale)
Tensile strength 48,3 MPa
Compressive strength > 1.1 GPa
Thermal expansion coefficient 5.5×10-7 cm/(cm·K)
Thermal conductivity coefficient 1.3 W/(m·K)
Heat capacity 45,3 J/mol
Softening point 1665 °C
Annealing point 1140 °C
Strain point 1070 °C
Maximum working temperature 1100 °C

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