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    2 Products

    Pressure-Rated Borosilicate Glass Discs

    Image of Product. Front orientation. Glass. 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"Ground55Not Rated445MIL-G-47033Clear8475K440000000
     
    Tempered
    6 3/4"-0.015" to 0.015"3/4"-0.031" to 0.031"Ground180Not Rated500MIL-G-2860Clear8475K64000000
     
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