PEEK vs. EN 1.4740 Stainless Steel

PEEK and EN 1.4740 stainless steel belong to fundamentally different material chemistries. PEEK is a polymeric material, while EN 1.4740 stainless steel 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 (31, 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 EN 1.4740 stainless steel.

Metric UnitsUS Customary Units

Thermal Properties

Maximum Temperature: Mechanical, °C		330
Maximum Temperature: Mechanical, °C		900

Melting Onset (Solidus), °C		340
Melting Onset (Solidus), °C		1370

Specific Heat Capacity, J/kg-K		1390 to 1700
Specific Heat Capacity, J/kg-K		490

Thermal Conductivity, W/m-K		0.25 to 0.93
Thermal Conductivity, W/m-K		18

Thermal Expansion, µm/m-K		15 to 52
Thermal Expansion, µm/m-K		10

Common Calculations

Stiffness to Weight: Axial, points		1.5 to 10
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		36 to 73
Stiffness to Weight: Bending, points		25

Thermal Diffusivity, mm²/s		0.1 to 0.51
Thermal Diffusivity, mm²/s		4.8

Elastic (Young's, Tensile) Modulus, GPa		4.0 to 24
Elastic (Young's, Tensile) Modulus, GPa		200

Elongation at Break, %		1.6 to 43
Elongation at Break, %		22

Density, g/cm³		1.3 to 1.5
Density, g/cm³		7.6

PEEK vs. EN 1.4740 Stainless Steel

Mechanical Properties

Thermal Properties

Otherwise Unclassified Properties

Common Calculations

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