At room temperature and 0-106 Hz, the dielectric constant of transparent quartz glass is 3.70. The opaque quartz glass is 3.50, and the dielectric constant increases slightly with the increase of temperature. After 450℃, the dielectric constant increases significantly. The relation between the dielectric loss of quartz glass and temperature is that the dielectric loss increases with the increase of temperature. Above 350℃, the dielectric loss increases more significantly with the increase of temperature.
Chemical properties: Acid and base resistance
Quartz glass is an acidic material, except hydrofluoric acid and hot phosphoric acid, other acids are inert, is the best acid resistant material. The corrosion degree of alkali and salt to quartz glass is very small at room temperature, so the use of quartz glass in these reagents cannot be ruled out.
On the relationship between thermal properties and conductivity of quartz glass, quartz glass is a kind of high purity special industrial technology glass containing only SiO2 single component. It has good thermal vibration resistance, deformation temperature and softening temperature are also in a very high range, but has very low thermal conductivity and heat conduction capacity, as well as very low dielectric loss and optical transmission ability in an extremely wide spectrum range from ultraviolet to infrared. And it has the particularity that other materials cannot replace.
Thermal properties of quartz glass
(1) linear expansion coefficient of quartz glass
The linear expansion coefficient of quartz glass is lower than that of all materials, and the doped quartz glass can even reach zero expansion.
(2) thermal vibration resistance of quartz glass
Because the thermal expansion coefficient of quartz glass is small, only 1/12 ~ 1/20 of ordinary glass. Therefore, it has a very good thermal vibration resistance, quartz glass sample burned to 1200 DEG C and quickly thrown into 20 DEG C water, repeated more than three times are not allowed to burst.