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Pressure-Rated Borosilicate Glass Discs
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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 | |||
Tempered | |||||||||||||
| 3 1/2" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 525 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K81 | 000000 | ||
| 4" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 450 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K82 | 00000 | ||
| 4 1/2" | -0.015" to 0.015" | 3/8" | -0.031" to 0.031" | Ground | 100 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K83 | 000000 | ||
| 5" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 300 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K84 | 000000 | ||
| 6" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 225 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K63 | 000000 | ||
| 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 | ||
| 8 3/8" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 105 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K65 | 000000 | ||
| 9" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 95 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K66 | 000000 | ||
| 10" | -0.015" to 0.015" | 3/4" | -0.031" to 0.031" | Ground | 85 | Not Rated | 500 | MIL-G-2860 | Clear | 8475K67 | 000000 | ||
