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 Alkali Free Borosilicate:

Corning® 7059 was the company's first generation fusion-formed product. During the 1980s, 7059 borosilicate sheet glass enabled the development of amorphous silicon Active Matrix LCD (AMLCD) technology in Japan. Today, that technology is in full-scale production around the world, resulting in an incredible variety of portable consumer, commercial and entertainment products.

Typical Applications

  • Low-Alkali Thin Film Substrate for Electronic applications
  • LCD Technology
  • Optical Windows
  • Sensor Technology  

7059 barium-borosilicate glass is a low alkali sheet glass with a good thermal shock resistance. The material has long been the standard of the electronics industry for thin-film circuits, which require special electrical properties. 7059 barium-borosilicate materials have a low alkali level below 0,3%. This is important in many electronic applications, because alkali ions are known to lower the performance, reliability and longevity of thin-film devices.

Glass Code: Corning

7059

Type

Alkali Free Borosilicate

Color

Clear

Principal Use

Optics & electrical substrates

Thermal Expansion

Multiply by 10-7cm/cm/°C

0 - 300°C.

46. 0

Viscosity Data

This data is subject to normal manufacturing variations.

Strain point °C.

539

Annealing point °C.

639

Softening point °C.

844

Density g/cm3

2.76

Log10 of Volume Resistivity ohm/cm.

250°C

13.1

Dielectric Properties

(1 MHz 20°C)

Dielectric constant

5. 84

Loss factor  %

.10

Refractive index  @

     435.8 nm

 

     546.1 nm

 

     643.8 nm

 

1. 544

 

1. 534

 

1. 531

Transmittance (t=O.5mm)

̃70% (320 nm)

̃90% (360 nm)

>90% (380-2200 nm)

Surface Smoothness

. 5 micro inch (typ)

Surface Flatness

. 004 in/in typ

 

 

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