Borosilicate Glass

Variants

BK7 Borosilicate Crown Glass
Pyrex Borosilicate Glass

Siblings

Fused Silica (Fused Quartz)
Soda-Lime Glass
Toughened (Tempered) Glass

Notes

Example stock products: test tube, microscope slides, tinted vial, crystallizing dish, and chromatography developing tank.

Properties

Compare
Bulk Modulus
35 to 45 GPa, or 5.0 to 6.5 106 psi
Density
2.23 to 2.51 g/cm3, or 139 to 156 lb/ft3
Elastic (Young's) Modulus
63 to 81 GPa, or 9.1 to 11 106 psi
Fracture Toughness
0.8 MPa-m1/2
Refractive Index
1.474 to 1.51
Minimum Operating Temperature
-40 °C, or -40 °F
Poisson's Ratio
0.2 to 0.206
Shear Modulus
31 to 40 GPa, or 4.4 to 5.8 106 psi
Specific Heat Capacity
Conventional
775 to 860 J/kg-K
Specific Heat Capacity
Volumetric
1700 to 2100 103 J/m3-K
Speed of Sound
160 to 170 103 m/s, or 520 to 550 103 ft/s
Stiffness-to-Weight Ratio
Bulk
15 to 18 MN-m/kg
Stiffness-to-Weight Ratio
Shear
14 to 16 MN-m/kg
Stiffness-to-Weight Ratio
Tensile
28 to 32 MN-m/kg
Thermal Conductivity
Ambient
1.1 to 1.35 W/m-K
Thermal Diffusivity
Thermal Expansion
20 to 100°C
3.3 to 7.1 µm/m-K

Only showing properties for which the substantial majority of variants have data.

Tags

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See Also

Charles Bray, Dictionary of Glass: Materials and Techniques, 2002 (link).

Christian Schittich et al., Glass Construction Manual, 1999 (link).

Eric Le Bourhis, Glass: Mechanics and Technology, 2007 (link).

James F. Shackelford and Robert H. Doremus (editors), Ceramic and Glass Materals: Structure, Properties and Processing, 2008 (link).

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