CORNING® 7720 NONEX TUNGSTEN

Corning® borosilicate glass 7720 was known as Nonex Glass which was widely used as a Tungsten Sealing glass. This glass has been discontinued and out of melt since 1995. This borosilicate glass has been replaced by Schott® Kovar Sealing 8250. You can also view Corning® 7052 Kovar Sealing glass and Corning® 7056 Kovar Sealing glass datasheet.

Nonex Tungsten Sealing Glass: Corning® 7720
Glass Code: Corning®
7720
Type

Borosilicate

Color
Clear
Principal Use
Electronic

Termal Expansion

Multiply by 10-7cm/cm/°C

0 - 300°C
36.0
25°C. to Setting Point
35

Upper Working Temp. for Annealed Glass

(Mechanical Considerations Only)

Normal Service °C
230
Extreme Service °C
460

Upper Working Temp. for Tempered Glass

(Mechanical Considerations Only)

Normal Service °C
260
Extreme Service °C
260

Thermal Shock Resistance

(15 x 15cm Annealed Plates) data is Approximately

3.2mm Thick °C
160
6.4mm Thick °C
130
12.7mm Thick °C
90
Thermal Stress Resistance °C
49

Viscosity Data

(This data is subject to normal manufacturing variations.)

Strain Point °C
485
Annealing Point °C
525
Softening Point °C
755

 

2015 © Glass Dynamics, LLC.
Designed by Kim Kelly