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Low Expansion Glass-ceramic vs. Borosilicate Glass

Both low expansion glass-ceramic and borosilicate glass are glass and glass-ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is low expansion glass-ceramic and the bottom bar is borosilicate glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
67 to 80
Flexural Strength, MPa 35
34 to 69
Knoop Hardness 530
510
Poisson's Ratio 0.22
0.21
Tensile Strength: Ultimate (UTS), MPa 53
280

Thermal Properties

Maximum Temperature: Mechanical, °C 690
360
Specific Heat Capacity, J/kg-K 800
830
Thermal Conductivity, W/m-K 1.5
1.2
Thermal Expansion, µm/m-K 1.7
3.3 to 5.1

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.7
5.4
Electrical Resistivity Order of Magnitude, 10x Ω-m 11
9.0 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.4
2.2 to 2.6
Light Transmission Range, µm 0.5 to 2.7
0.3 to 2.5
Refractive Index 1.5
1.5

Common Calculations

Stiffness to Weight: Axial, points 19
15 to 17
Stiffness to Weight: Bending, points 59
55 to 61
Strength to Weight: Axial, points 6.1
30 to 35
Strength to Weight: Bending, points 13
36 to 43
Thermal Diffusivity, mm2/s 0.76
0.54 to 0.63
Thermal Shock Resistance, points 28
50 to 91