Optical Glass picture, 7059
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CORNING 7059 / 7059F

Low alkali barium-borosilicate glass

Typical Applications

  • Low-alkali thin film glass substrate for electronic components
  • Substrate for optical coatings
  • LCD-technology
  • Optical windows
  • Sensor covers
  • Micro-optics

The barium-borosilicate glass 7059 is an almost alkali-free sheet glass from CORNING that features a good thermal shock resistance. It has been a standard of the electronics industry for thin-film circuits for a long time as glass materials with unique electrical mechanical and thermal properties. 7059F glass is fusion drawn into glass sheets to final thickness obtaining a flat, smooth surface finish directly from the molten glass. 7059 is made by a slot-draw process and does not achieve the planarity as 7059F glass. Both 7059 glass materials have a low level of alkali which is less than 0,3% which is essential for many electronic applications because free alkali ions in glass are known to lower the performance, reliability, and longevity of LCD thin-film components. For further technical information about 7059 glass, please use our information request form.


To request a quotation for windows or substrates made of 7059 glass materials with individual dimensions, please use the button below


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Note: The production of 7059 and 7059F glass materials have been terminated by CORNING a long time ago. We still stock some remaining 7059 (non-F) glass at 0,7 mm thickness though. The direct follow-up glass is CORNING's 1737F and please take into account that there are some other materials that you can use as a replacement in many cases. If you search for alternative glasses, please search through our website. If you need further help in engineering design, please do not hesitate to contact us.



 Transmission curve of 7059 glass


Refractive Index

  • nD = 1,5333 (589,3 nm)


  • 2,76 g/cm3 (20 °C)

Young's Modulus

  • 6,89 x 103 kg/mm2

Coefficient of Thermal Expansion

  • 46,0 x 10-7/ °C (0-300 °C)
  • 50,1 x 10-7/ °C (25-598 °C)


  • Softening Point 844 °C
  • Annealing Point 639 °C
  • Strain Point 593 °C

Electrical Properties

  • Dielectric Constant 5,84 (20 °C / 1 MHz)
  • Dielectric Loss Factor 0,1% (20 °C / 1 MHz)

Standard Glass Thicknesses (non-F materials)

Thicknesses Tolerance Thicknesses Tolerance
0,4 mm* ±0,127 0,5 mm* ±0,127
0,7 mm ±0,127 0,8 mm* ±0,127
1,1 mm* ±0,127 1,2 mm* ±0,127
The thicknesses marked with a "*" are not available anymore.


All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".


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