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What are the properties of Borosilicate Glass?

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    What are the properties of Borosilicate Glass?
    Update Time:2018-04-02

    What are the properties of Borosilicate Glass?

     Metric US
    Coefficient of mean linear thermal3.3 · 10-6 K-1 3.3 · 10-6 K-1
    expansion a acc. to DIN ISO 7991(20 °C; 300 °C) (68 °F; 572 °F)
    Transformation temperature Tg525 °C 977 °F
    Density r at 25 °C2.23 g · cm-3 139.2 lb · ft-3
    Modulus of elasticity E (Young’s modulus)63 · 103 N · mm-2 91 · 105 lb · in-2 (psi)
    Poisson’s ratio m0.20 0.20
    Thermal conductivity lw at 90 °C1.2 W · m-1 · K-1 0.69 Btu · hr -1 · ft-1 · °F-1
    Refractive index (l = 587.6 nm) nd1.473 1.473
    Stress-optical coefficient (DIN 52 314) K4.0 · 10-6 mm2 · N -1 4.0 · 10-6 mm2 · N-1


    Chemical Composition
    SiO2 B2O3Na2O +K2O Al2O3
    81 134 2

    Chemical Resistance
    Hydrolytic Class (DIN ISO 719)HGB 1
    Acid Class (DIN 12116)Class S 1
    Alkali Class (DIN ISO 695)Class A 2

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