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Borosilicate Glass

Borosilicate glass is a glass-type material. It has four common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare borosilicate glass to other glass and glass-ceramics (top) and the entire database (bottom).

Compressive (Crushing) Strength

2000 MPa 290 x 103 psi

Elastic (Young's, Tensile) Modulus

68 to 81 GPa 9.9 to 12 x 106 psi

Flexural Strength

34 to 69 MPa 5.0 to 10 x 103 psi

Fracture Toughness

0.8 MPa-m1/2 730 psi-in1/2

Knoop Hardness

510

Poisson's Ratio

0.21

Strength to Weight Ratio

120 kN-m/kg

Tensile Strength: Ultimate (UTS)

280 MPa 41 x 103 psi

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

4.8 to 5.5

Dielectric Constant (Relative Permittivity) At 1 MHz

5.4

Dielectric Strength (Breakdown Potential)

5.0 to 35 kV/mm 0.2 to 1.4 V/mil

Electrical Dissipation At 1 Hz

0.0025 to 0.018

Electrical Dissipation At 1 MHz

0.0017 to 0.0086

Electrical Resistivity Order of Magnitude

9.0 to 12 10x Ω-m

Other Material Properties

Density

2.2 to 2.7 g/cm3 140 to 170 lb/ft3

Light Transmission Range

0.3 to 2.5 µm

Maximum Thermal Shock

160 °C 320 °F

Melting Onset (Solidus)

560 °C 1040 °F

Refractive Index

1.5

Specific Heat Capacity

830 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

1.2 W/m-K 0.68 BTU/h-ft-°F

Thermal Diffusivity

0.59 m2/s

Thermal Expansion

3.3 to 5.1 µm/m-K

Followup Questions

Variant Materials

Further Reading

ASTM E438: Standard Specification for Glasses in Laboratory Apparatus

Dictionary of Glass: Materials and Techniques, Charles Bray, 2002

Glass: Mechanics and Technology, Eric Le Bourhis, 2007

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials