Corning Pyrex® 7740

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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.

Please feel free to navigate to other pages within our site to see more information on all of our high precision machining services, materials and capabilities. If you would like more information please click here to send a request, or visit our Frequently Asked Questions page.

Other Glass/Quartz Materials

Fused Quartz
Corning ULE®

2.23 gm/cc

418 Knoop

Modulus of Elasticity

9.1 x 106 psi

Poisson's Ratio
Dielectric Constant
4.6 (@ 1 MHz)
Volume Resistivity

8 x 1010 ohm-cm

Coefficient of Thermal Expansion

3.3 x 10-6/°C

Thermal Conductivity
1.35 W/mK
Specific Heat
0.185 cal/g °C
Maximum Working Temperature
500 °C
Index of Refraction


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.

*Click on a Property to see a comparison of up to 10 materials