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Glass-Bonded Mica

Glass-bonded mica is a glass-type material. It has the lowest tensile strength and the highest thermal conductivity among glass and glass-ceramics. The graph bars on the material properties cards below compare glass-bonded mica to other glass and glass-ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Compressive (Crushing) Strength

270 MPa 39 x 103 psi

Elastic (Young's, Tensile) Modulus

71 GPa 10 x 106 psi

Flexural Strength

79 MPa 12 x 103 psi

Impact Strength: Notched Izod

85 J/m 1.6 ft-lb/in

Tensile Strength: Ultimate (UTS)

39 MPa 5.7 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

450 °C 840 °F

Maximum Thermal Shock

110 °C 240 °F

Specific Heat Capacity

500 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

23 W/m-K 13 BTU/h-ft-°F

Thermal Expansion

6.7 µm/m-K

Other Material Properties


2.6 g/cm3 160 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

20 kV/mm 0.78 V/mil

Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

10 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

52 points

Strength to Weight: Axial

4.1 points

Strength to Weight: Bending

9.7 points

Thermal Diffusivity

18 mm2/s

Thermal Shock Resistance

5.9 points

Followup Questions

Further Reading

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015