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Machinable Glass-ceramic vs. Engineering Porcelain

Machinable glass-ceramic belongs to the glass and glass-ceramics classification, while engineering porcelain belongs to the oxide-based engineering ceramics. There are 25 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

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

Machinable Glass-CeramicEngineering Porcelain
Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 310
590
Elastic (Young's, Tensile) Modulus, GPa 67
67 to 150
Flexural Strength, MPa 96
43 to 160
Fracture Toughness, MPa-m1/2 2.5
2.0
Knoop Hardness 250
600
Poisson's Ratio 0.29
0.17
Shear Modulus, GPa 26
34
Tensile Strength: Ultimate (UTS), MPa 84
130

Thermal Properties

Maximum Temperature: Mechanical, °C 760
1170
Specific Heat Capacity, J/kg-K 790
600 to 1000
Thermal Conductivity, W/m-K 1.2
1.8 to 6.5
Thermal Expansion, µm/m-K 21
2.0 to 6.6

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 6.0
5.0 to 10
Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
6.5
Dielectric Strength (Breakdown Potential), kV/mm 27
11 to 25
Electrical Dissipation At 1 Hz 0.0049
0.0043 to 0.028
Electrical Dissipation At 1 MHz 0.0050
0.00043 to 0.013
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
9.0 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.7
2.3 to 3.0

Common Calculations

Stiffness to Weight: Axial, points 14
16 to 29
Stiffness to Weight: Bending, points 51
49 to 65
Strength to Weight: Axial, points 8.8
12 to 16
Strength to Weight: Bending, points 16
19 to 25
Thermal Diffusivity, mm2/s 0.56
0.73 to 3.9
Thermal Shock Resistance, points 4.3
11 to 53