Corning® borosilicate glass 7052 was widely used as a Kovar Sealing glass. This glass has been discontinued and out of melt since 1991. This borosilicate glass was replaced with Corning® 7056 Kovar Sealing glass which then had been discontinued and replaced by Corning® 7720 Nonex Tungsten Sealing glass which also has been discontinued and now replaced by Schott® 8250 Kovar Sealing glass.
| Kovar Sealing Glass: Corning® 7052 | ||
|---|---|---|
| Glass Code: Corning® | 7052 |
|
| Type | Borosilicate |
|
| Color | Clear |
|
| Principal Use | Electronic |
|
Termal Expansion Multiply by 10-7cm/cm/°C |
0 - 300°C |
46.0 |
25°C. to Setting Point |
53 |
|
Upper Working Temp. for Annealed Glass (Mechanical Considerations Only) |
Normal Service °C |
200 |
Extreme Service °C |
420 |
|
Upper Working Temp. for Tempered Glass (Mechanical Considerations Only) |
Normal Service °C |
210 |
Extreme Service °C |
210 |
|
Thermal Shock Resistance (15 x 15cm Annealed Plates) data is Approximately |
3.2mm Thick °C |
125 |
6.4mm Thick °C |
100 |
|
12.7mm Thick °C |
70 |
|
| Thermal Stress Resistance °C | 41 |
|
Viscosity Data (This data is subject to normal manufacturing variations.) |
Strain Point °C |
435 |
Annealing Point °C |
480 |
|
Softening Point °C |
710 |
|