Corning® 7740


Corning® 7740 is a clear, colorless borosilicate glass by Corning with very similar properties to Borofloat® 33. To produce this glass, particles of silica sand, boric acid, fluxes and stabilizers mix together. Next, a furnace heats the mixture at 1600°C for up to 24 hours to remove any bubbles and imperfections. The glass is formed in blocks, as opposed to sheets, so they must be sliced, ground, lapped, and polished before being used.


  • Good thermal shock resistance
  • high temperature resistance
  • low thermal expansion – same as silicon
  • high acid resistance
  • great optical transmission over a wide range of wavelengths, from ultraviolet to infrared.


Due to their similarities, these wafers have many of the same applications and are interchangeable with Borofloat® substrates. Some common uses for these substrates are LCD displays, dielectric coating, sensor substrates, neutron absorber, and in high temperature environments.

Manufacture Reports and Reference

Corning® 7740 Manufacture Product Information Sheet
Corning® 7740 Glass Substrates Material Safety Data Sheet (MSDS)
Corning® 7740 Restriction of Hazardous Substances (RoHS)
Corning® 7740 Registration, Evaluation, Authorization and Restriction of Chemicals (REACH)
Corning® 7740 SGS Report