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PEEK vs. Grade 366 Molybdenum

PEEK and grade 366 molybdenum belong to fundamentally different material chemistries. PEEK is a polymeric material, while grade 366 molybdenum is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 11 material properties with values for both materials. Properties with values for just one material (27, 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 grade 366 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0 to 24
300
Elongation at Break, % 1.6 to 43
2.2
Tensile Strength: Ultimate (UTS), MPa 97 to 200
580

Thermal Properties

Specific Heat Capacity, J/kg-K 1390 to 1700
210
Thermal Expansion, µm/m-K 15 to 52
7.6

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
12

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 10
14
Stiffness to Weight: Bending, points 36 to 73
18
Strength to Weight: Axial, points 20 to 41
13
Strength to Weight: Bending, points 36 to 55
13
Thermal Shock Resistance, points 34 to 57
18