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Alumina vs. PMP

Alumina and PMP belong to fundamentally different material chemistries. Alumina is a ceramic material, while PMP is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is alumina and the bottom bar is PMP.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220 to 370
1.1
Tensile Strength: Ultimate (UTS), MPa 210 to 290
24

Thermal Properties

Maximum Temperature: Mechanical, °C 650 to 1730
140
Melting Onset (Solidus), °C 2040
230
Specific Heat Capacity, J/kg-K 870 to 940
1750
Thermal Conductivity, W/m-K 14 to 30
0.17
Thermal Expansion, µm/m-K 6.7 to 8.2
120

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 8.0 to 9.0
2.1
Dielectric Strength (Breakdown Potential), kV/mm 8.9 to 12
28
Electrical Resistivity Order of Magnitude, 10x Ω-m 6.2 to 14
14

Otherwise Unclassified Properties

Density, g/cm3 3.4 to 4.1
0.83

Common Calculations

Stiffness to Weight: Axial, points 35 to 53
0.74
Stiffness to Weight: Bending, points 57 to 62
41
Strength to Weight: Axial, points 14 to 23
8.0
Strength to Weight: Bending, points 19 to 28
22
Thermal Diffusivity, mm2/s 3.7 to 10
0.12
Thermal Shock Resistance, points 4.9 to 14
13