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PEEK vs. ACI-ASTM CC50 Steel

PEEK and ACI-ASTM CC50 steel belong to fundamentally different material chemistries. PEEK is a polymeric material, while ACI-ASTM CC50 steel is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (28, 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 ACI-ASTM CC50 steel.

Polyetheretherketone (PEEK)ACI-ASTM CC50 (J92615) Cast Stainless Steel
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0 to 24
200
Tensile Strength: Ultimate (UTS), MPa 97 to 200
430

Thermal Properties

Maximum Temperature: Mechanical, °C 330
1100
Melting Onset (Solidus), °C 340
1370
Specific Heat Capacity, J/kg-K 1390 to 1700
490
Thermal Conductivity, W/m-K 0.25 to 0.93
17
Thermal Expansion, µm/m-K 15 to 52
11

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
7.6

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 10
15
Stiffness to Weight: Bending, points 36 to 73
26
Strength to Weight: Axial, points 20 to 41
16
Strength to Weight: Bending, points 36 to 55
17
Thermal Diffusivity, mm2/s 0.1 to 0.51
4.5
Thermal Shock Resistance, points 34 to 57
14