From Wikipedia, the free encyclopedia.
Fused quartz is a man-made material manufactured principally from sands. It is non-crystalline, and in a high purity state is a useful material for high performance fluid and gas delivery. Its mechanical and thermal properties are superior to that of glass due to its purity (or rather, its lack of impurities). For these reasons, it finds use in situations such as semiconductor fabrication and laboratory equipment.
See also: quartz, list of minerals
Properties of Clear Fused Quartz
(Based on information in Fused Quartz Catalogue Q-7A, General Electric Company)
- Density: 2.203 g/cm3
- Hardness: 7 (Modified Scale); 5.3-6.5 (Mohs Scale)
- Tensile strength: 48.3 MPa
- Compressive strength: >1.1 GPa
- Bulk modulus: ~37 GPa
- Rigidity modulus: 31 GPa
- Young's modulus: 71.7 GPa
- Poisson's ratio: 0.16
- Coefficient of thermal expansion: 5.5E-7 cm/(cm*K) (average from 20°C to 320°C)
- Thermal conductivity: 1.3 W/(m×K)
- Heat capacity: 45.3 J/mol
- Softening point: ~1665°C
- Annealing point: ~1140°C
- Strain point: 1070°C
- Electrical resistivity: >1018 Ω×m
- Dielectric constant: 3.75 at 20°C 1 MHz
- Dielectric loss factor: less than 0.0004 at 20°C 1 MHz
- Index of refraction: 1.4585
