Thermal expansion coefficient of quartz glass is extremely small, the lowest sensitivity to thermal changes. Due to high viscosity quartz glass, even in a molten state viscosity remains large, so high temperature performance superior to any other kind of glass. The viscosity of quartz glass greatly influenced by hydroxyl content and impurity content, hydroxyl and metal content increases viscosity.
- Each characteristic temperature of quartz glass
|Characteristic temperature||Transparent quartz glass||Synthetic quartz glass|
|Strain and Temperature||1075||1025|
|Thermal processing temperature||1700-2100||1600-2000|