PYREX® 7740

Borosilicate Glass from CORNING

Special Properties

  • High-temperature resistance
  • Coefficient of thermal expansion matches that of silicon (important for anodic bonding applications)
  • Good thermal shock resistance
  • Small specific weight
  • Borosilicate glass composition

Typical Applications

  • Glass wafers for anodic bonding
  • Substrates for dielectric coatings
  • Heat shields
  • Chemically resistant glass covers
  • Neutron absorbers
  • High-temperature environments
  • Sensor technology
  • Applications in science, research, and development
  • Harsh Environments
  • Material for chemical laboratory equipment

Related glass types

PYREX® 7740 is a borosilicate glass from CORNING with excellent thermal properties. A low expansion coefficient of only about one-third of that of soda-lime glass materials ensures high thermal shock resistance. The material has been used to manufacture temperature-resistant optics for a long time.

PYREX® borosilicate glass raw blocks nullspacer

Unprocessed PYREX® borosilicate glass comes in unpolished large blocks or as rolled sheets. We can grind, polish, and further process these materials to meet customer-specific requirements.

PYREX® wafers are a standard for the semiconductor industry. They are a perfect solution for the anodic bonding of glass to silicon because the thermal expansion of the PYREX® borosilicate glass closely matches that of silicon.

Unpolished borosilicate glass raw material from CorningA much better chemical resistance than soda-lime materials and exquisite optical transmission over a wide wavelength range made PYREX® a versatile option for many optical applications that were not possible with ordinary soda-lime glass.

 

PYREX SG3.3

PYREX® rolled sheets and block glasses were discontinued many years ago. However, CORNING released PYREX SG3.3 in the meantime, now available in thicknesses from 0.3–2.3 mm. Please send us your inquiry if you are interested in more details about this PYREX® borosilicate glass design.

 

Please use the button below to request a quotation for windows, substrates, wafers, or other optics made of PYREX® with individual dimensions.

 

Get a Quote

 

Please look at our quartz and fused silica materials for higher-temperature requirements. Also we have fused quartz with sight-glass quality available.

 

Specifications


PYREX® Transmission at 2 mm thickness

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Refractive Index

  • nd = 1.474 (588 nm)

Density

  • 2.23 g/cm3

Coefficient of Thermal Expansion (0–300 °C)

  • 3.25 × 10-6

Young's Modulus

  • 6400 kg/mm2

Dielectric Constant

  • 4.6 (20 °C ; 1 MHz)

Loss Factor

  • 0.5% (20 °C ; 1 MHz)

Further detailed glass specifications are available on request.

All data and specifications given are average guide values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.

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Last update: September 24, 2025