Quartz Glass
Quartz glass is characterized by an extremely low expansion coefficient of 5.5 × 10⁻⁷ mm, which is about 1/34 of the coefficient of copper and only 1/7 of borosilicate glass. It also exhibits very high thermal shock resistance – for example, the glass can be heated to over 1500°C and then immersed in water without cracking.
Quartz glass transmits UV radiation, and its infrared transmittance extends up to approximately 4 micrometers.
Basic parameters of quartz glass:
| PARAMETER | VALUE |
| Density | 2.203 g/cm3 |
| Hardness | 5.3–6.5 (skala Moh’a) |
| Tensile strength | 48,3 MPa |
| Compressive strength | > 1.1 GPa |
| Thermal expansion coefficient | 5.5×10-7 cm/(cm·K) |
| Thermal conductivity | 1.3 W/(m·K) |
| Heat capacity | 45,3 J/mol |
| Softening temperature | 1665 °C |
| Annealing temperature | 1140 °C |
| Stress relief temperature | 1070 °C |
| Maximum operating temperature | 1100 °C |
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