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 This borosilicate glass has been replaced by Schott® Kovar Sealing 8250.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 |
|