Corning 7059

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.

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