Fused quartz is the purest form of glass, it contains above 99,95% of silicon dioxide (SiO2). This specific composition gives outstanding properties to this material. Saint-Gobain Advanced Ceramic Composites (formerly Saint-Gobain Quartz) is exclusively using natural Quartz which can be extracted at high purity only from a very limited number of mines on Earth. Our know-how is to process this highly particular material into various forms without altering its original properties. For instance, we are able to process it into: yarn, roving, felt or wool. Further details regarding these particular products can be found in our technical datasheets.
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Silica
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Main properties
- High chemical purity and resistance.
- High softening temperature and thermal resistance.
- Low thermal expansion with high resistance to thermal shocks.
- High electromagnetic transparency.
- High radiation resistance
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Technical datasheets
Properties Description Value Units Physical Density 2.2 g/cm3 Poisson's coefficient 0.16 - Ultrasonic wave propagation: Longitudinal
5960 m.s-1 Tranversal
3770 m.s-1 Internal Dampening 0.08 dBm-1MHz-1 Properties Description Value Units Electrical
Dielectric constant at 10 GHz 3.74 - Loss factor at 10 GHz 0.0002 - Dielectric strength ~3.7 x 107 V.m-1 Resistivity at 200°C 1 x 1020 Ω.m Resistivity at 800°C 6 x 1020 Ω.m Resistivity at 1000°C 1 x 108 Ω.m Properties Description Value Units Thermal Linear expansion coefficient 0.54 x 10-6 K-1 Specific heat at 20°C 7.5 x 102 J.kg-1K-1 Heat conductivity 1.38 W.m-1K-1 Annealing point (log10n=13) 1220 °C Softening point (log10n=7.6) 1700 °C Properties Description Value Units Optical Refractive index 1.4585 - Dispersion 67 - Field of transparency 0.2 to 4 µm -
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