Fused Quartz / Fused Silica

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For over 60 years we have been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.

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PropertyValue
General
Chemical Formula

SiO2

Mechanical
Density
2.2 gm/cc
Hardness

570 Knoop

Tensile Strength
7 kpsi
Modulus of Elasticity

10.5 x 106 psi

Flexural Strength
> 160 kpsi
Compressive Strength
160 kpsi
Poisson's Ratio
0.17
Fracture Toughness
1.2 MPa m<sup>½</sup>
Electrical
Dielectric Strength
1270 ac V/mil
Dielectric Constant
3.8 (@ 1 MHz)
Volume Resistivity

7 x 109 ohm-cm

Thermal
Coefficient of Thermal Expansion

0.6 x 10-6/°C

Thermal Conductivity
1.4 W/mK
Specific Heat
0.16 cal/g °C
Maximum Working Temperature
600-1000 °C
Optical
Index of Refraction

1.459

Transmission Band
0.2 - 3.5 Wavelength (microns)

All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

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