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 mm2/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