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PEEK vs. Aluminum Nitride

PEEK and aluminum nitride belong to fundamentally different material chemistries. PEEK is a polymeric material, while aluminum nitride is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (25, 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 PEEK and the bottom bar is aluminum nitride.

Polyetheretherketone (PEEK)Aluminum Nitride (AlN)
Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 120 to 300
2100
Elastic (Young's, Tensile) Modulus, GPa 4.0 to 24
330
Flexural Strength, MPa 150 to 330
190 to 400

Thermal Properties

Maximum Temperature: Mechanical, °C 330
1380
Specific Heat Capacity, J/kg-K 1390 to 1700
780
Thermal Conductivity, W/m-K 0.25 to 0.93
80 to 190
Thermal Expansion, µm/m-K 15 to 52
4.2 to 5.4

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 3.0 to 14
10 to 12

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
2.9 to 3.3

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 10
55 to 63
Stiffness to Weight: Bending, points 36 to 73
69 to 80
Thermal Diffusivity, mm2/s 0.1 to 0.51
31 to 74