Fused quartz

Fused quartz

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

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