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Pressure-Rated Borosilicate Glass Discs
 |
Commonly used as sight glass. Also called Pyrex and Schott glass, borosilicate glass resists clouding and pitting and is highly chemical and heat resistant. With a low rate of thermal expansion, it stays dimensionally stable during changes in temperature.
Tempered—Tempered glass is stronger than annealed glass.
Temp. | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dia. | Dia. Tolerance | Lg. | Lg. Tolerance | Edge Fabrication | Max. Pressure, psi | Min. | Max., ° F | Mil. Spec. | Color | Each | |||
Annealed | |||||||||||||
| 6 3/4" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 55 | Not Rated | 445 | MIL-G-47033 | Clear | 8475K44 | 0000000 | ||
Tempered | |||||||||||||
| 6 3/4" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 180 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K64 | 000000 | ||
