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Machinable Glass-ceramic vs. Soda-lime Glass

Both machinable glass-ceramic and soda-lime glass are glass and glass-ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is machinable glass-ceramic and the bottom bar is soda-lime glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
70 to 71
Knoop Hardness 250
570
Poisson's Ratio 0.29
0.23
Shear Modulus, GPa 26
29
Tensile Strength: Ultimate (UTS), MPa 84
41 to 180

Thermal Properties

Maximum Temperature: Mechanical, °C 760
300
Specific Heat Capacity, J/kg-K 790
720 to 800
Thermal Conductivity, W/m-K 1.2
1.0 to 1.1
Thermal Expansion, µm/m-K 21
8.8 to 9.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
7.3 to 7.4
Dielectric Strength (Breakdown Potential), kV/mm 27
13

Otherwise Unclassified Properties

Density, g/cm3 2.7
2.4

Common Calculations

Stiffness to Weight: Axial, points 14
16
Stiffness to Weight: Bending, points 51
56
Strength to Weight: Axial, points 8.8
4.6 to 20
Strength to Weight: Bending, points 16
11 to 28
Thermal Diffusivity, mm2/s 0.56
0.51 to 0.6
Thermal Shock Resistance, points 4.3
4.7 to 20