7059 / 7059F Barium-Borosilicate Glass

Typical Applications

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

7059 barium-borosilicate glass is a low alkali technical sheet glass from Corning with a good thermal shock resistance. 7059 glass 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 glass is slot drawn and is not as smooth as the 7059F. Both 7059 materials have a low level of alkali which is below 0,3%. This is important for many electronic application, because alkali ions are known to lower the performance, reliability and longevity of thin-film devices.

Specifications of 7059*

 
Show transmission curve of 7059 glass

Refractive Index

• n_D = 1,5333 (589,3nm)

Density

• 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)

Viscosity

• 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

*Please consider the "Notes on technical specifications"


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