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Low Expansion Glass-Ceramic

Low expansion glass-ceramic is a glass-type material. The graph bars on the material properties cards below compare low expansion glass-ceramic 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

Elastic (Young's, Tensile) Modulus

83 GPa 12 x 106 psi

Flexural Strength

35 MPa 5.1 x 103 psi

Knoop Hardness

530

Poisson's Ratio

0.22

Tensile Strength: Ultimate (UTS)

53 MPa 7.7 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

690 °C 1270 °F

Specific Heat Capacity

800 J/kg-K 0.19 BTU/lb-°F

Thermal Conductivity

1.5 W/m-K 0.86 BTU/h-ft-°F

Thermal Expansion

1.7 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

5.7

Electrical Resistivity Order of Magnitude

11 10x Ω-m

Otherwise Unclassified Properties

Density

2.4 g/cm3 150 lb/ft3

Light Transmission Range

0.5 to 2.7 µm

Refractive Index

1.5

Common Calculations

Stiffness to Weight: Axial

19 points

Stiffness to Weight: Bending

59 points

Strength to Weight: Axial

6.1 points

Strength to Weight: Bending

13 points

Thermal Diffusivity

0.76 m2/s

Thermal Shock Resistance

28 points

Followup Questions

Further Reading

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