Optical Glass picture, 7059
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7059 / 7059F

Low alkali barium-borosilicate glass

Typical Applications

  • Low-alkali thin film glass substrate for electronics
  • Substrate for optical coatings
  • LCD Technology
  • Optical Windows
  • Sensor Technology

7059 barium-borosilicate glass is an almost alkali-free technical flat glass from Corning and features a good thermal shock resistance. It has long been the standard of the electronics industry for thin-film circuits, which require special electrical properties. 7059F glass is fusion drawn into sheets at final thickness, obtaining a flat smooth surface finish directly form the molten glass. 7059 is slot drawn and is not as smooth as the 7059F which is fusion drawn. Both 7059 glass materials have a low level of alkali which is less than 0,3%. This is important for many electronic applications, because alkali ions are known to lower the performance, reliability and longevity of thin-film devices. For further technical information, please use our information request form.

To request windows or substrates made of 7059 glass with individual dimensions, please click the button below:

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Note: The production of 7059 and 7059F has been discontinued a long time ago. We still stock some remaining 7059 material though. The direct follow-up glass materials are 1737 and 1737F from Corning.


Transmission curve of 7059 glass

Refractive Index

  • nD = 1,5333 (589,3nm)


  • 2,76 g/cm3 (20°C)

Young's Modulus

  • 6,89 x 103 kg/mm2

Coefficient of Thermal Expansion (20-300°C)

  • 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 / 1MHz)

Standard Thicknesses

Thicknesses Tolerance Thicknesses Tolerance
0,4mm ±0,127 0,5mm ±0,127
0,7mm ±0,127 0,8mm ±0,127
1,1mm ±0,127 1,2mm ±0,127

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