Precision Glass
Using proprietary glass forming processes, GBC produces precision glass tubing and rods. These glass components are used in miniature fuse bodies, lenses for photo transistors, glass-to-metal seals used in IC packages, Erasable/Programmable Read Only Memory (EPROM) and Read Only Memory (ROM) glass lenses...and many others.
GBC employs two distinct processing techniques. Each has the ability to manufacture small or large quantities of glass tubing and rod to precise tolerances.
The "Direct Draw" process enables GBC to draw in a variety of colors and compositions to meet customer demands.
The "Re-Draw" process allows GBC to provide custom drawn tubing from readily available compositions.
| Precision Glass Data | ||||||||
|---|---|---|---|---|---|---|---|---|
| Glass Code | Basic Composition | **Forms | Uses | C.T.E. x 10-7 in/in/°C | Softening Point. °C | Annealing Point. °C | Strain Point °C | Density g/cc |
| K-Glass | Borosilicate | TR | Kovar Sealing | 45 | 720 | 500 | 440 | 2.20 |
| 7052 | TR | 47 | 712 | 484 | 440 | 2.27 | ||
| x SCQ-5 (EN-1) | T | 47 | 716 | 4482 | 437 | 2.26 | ||
| ♦ 8250 | TR | 50 | 720 | 507 | 450 | 2.28 | ||
| 7070 | TR | Microwave | 32 | - | 496 | 456 | 2.13 | |
| 7740 (Pyrex®) | T | Fuse Casings | 32 | 821 | 560 | 510 | 2.23 | |
| SG-80 | Soda Lime | TR | Dumet Sealing Compression Seals Lamps | 93 | 677 | 480 | 450 | 2.60 |
| 0080 | TR | 93 | 696 | 514 | 473 | 2.47 | ||
| SCA-1 (R-6) | TR | 93 | 700 | 525 | 486 | 2.53 | ||
| ♦ 8061 | Soda Barium | TR | Compression Seals Dumet Sealing | 93 | 677 | 480 | 450 | 2.60 |
| 9013 | TR | 88 | 656 | 462 | 423 | 2.64 | ||
| SCM-5 (TM-7) | TR | 90 | 658 | 454 | 415 | 2.58 | ||
| VHX-15 | No Lead | T | Steel Dumet Compression Seals Diode Applications | 94 | 600 | - | - | 4.25 |
|
Fusite Glass Codes Corning Glass Codes |
Sem-Com Glass Codes (Kimble Glass Equivalent) Schott Glass Codes |
**Forms: T - Tubing, R - Rod |
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Properties of Some Commonly Used Metals
| Metal | Melting Pt. °C | Vacuum Maximum Operating Temp. °C | Air Maximum Operating Temp. °C | C.T.E x 10-7 in/in/°C | Thermal Conductivity Cat./Sq. Cm/Cm/°C/Xec. |
|---|---|---|---|---|---|
| Tungsten | 3350 | 3000 | 300 | 44 | 0.38 |
| Molybdenum | 2450 | 2000 | 200 | 55 | 0.35 |
| Kovar | 1450 | 1000 | 600 | 47 | 0.04 |
| Platinum | 1750 | 1600 | 1400 | 93 | 0.166 |
| Copper | 1083 | 400 | 150 | 178 | 0.092 |
| Nickel | 1452 | 900 | 400 | 145 | 0.14 |
| Dumet | 400 | 150 | 7.1 longitudinal 9.0 radial |
||
| iron | 1535 | 500 | 500 | 128 | |
| Titanium | 1800 | 1000 | 250 | ||
| Type 304 Stainless | 1426 | 800 | 800 | 178 |
