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Borosilicate Glass

Borosilicate glass is a glass-type material. The properties of borosilicate glass include four common variations. The property values on this page show ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare borosilicate glass to other glass and glass-ceramics (top) and the entire database (bottom). The length of each bar shows the given value as a % of the largest value in the relevant set.

Mechanical Properties

Compressive (Crushing) Strength

2000 MPa 290 x 103 psi

Elastic (Young's, Tensile) Modulus

67 to 80 GPa 9.7 to 12 x 106 psi

Flexural Strength

34 to 69 MPa 4.9 to 10 x 103 psi

Fracture Toughness

0.8 MPa-m1/2 0.73 x 103 psi-in1/2

Knoop Hardness

510

Poisson's Ratio

0.21

Tensile Strength: Ultimate (UTS)

280 MPa 41 x 103 psi

Thermal Properties

Maximum Thermal Shock

160 °C 320 °F

Melting Onset (Solidus)

560 °C 1040 °F

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 Expansion

3.3 to 5.1 µm/m-K

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 34 kV/mm 0.2 to 1.3 V/mil

Electrical Dissipation At 1 Hz

0.0026 to 0.018

Electrical Dissipation At 1 MHz

0.0017 to 0.0088

Electrical Resistivity Order of Magnitude

9.0 to 12 10x Ω-m

Otherwise Unclassified Properties

Density

2.2 to 2.6 g/cm3 140 to 160 lb/ft3

Light Transmission Range

0.3 to 2.5 µm

Refractive Index

1.5

Common Calculations

Stiffness to Weight: Axial

15 to 17 points

Stiffness to Weight: Bending

55 to 61 points

Strength to Weight: Axial

30 to 35 points

Strength to Weight: Bending

36 to 43 points

Thermal Diffusivity

0.54 to 0.63 m2/s

Thermal Shock Resistance

50 to 91 points

Followup Questions

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