# 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 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

71 *GPa* 10 *x 10 ^{6} psi*

Flexural Strength

79 *MPa* 12 *x 10 ^{3} psi*

Impact Strength: Notched Izod

85 *J/m* 1.6 *ft-lb/in*

Tensile Strength: Ultimate (UTS)

39 *MPa* 5.7 *x 10 ^{3} 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

Density

2.6 *g/cm ^{3}* 160

*lb/ft*

^{3}Dielectric Constant (Relative Permittivity) At 1 MHz

6.8

Dielectric Strength (Breakdown Potential)

20 *kV/mm* 0.78 *V/mil*

Electrical Dissipation At 1 MHz

0.0016

Electrical Resistivity Order of Magnitude

10 *10 ^{x} 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 *m ^{2}/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