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PEEK vs. Solder Alloy 301

PEEK and solder alloy 301 belong to fundamentally different material chemistries. PEEK is a polymeric material, while solder alloy 301 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 (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 solder alloy 301.

Polyetheretherketone (PEEK)ISO Solder Alloy 301 (IEC B580, Bi58Sn42)
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0 to 24
40
Elongation at Break, % 1.6 to 43
51
Tensile Strength: Ultimate (UTS), MPa 97 to 200
55

Thermal Properties

Melting Onset (Solidus), °C 340
140
Specific Heat Capacity, J/kg-K 1390 to 1700
160
Thermal Conductivity, W/m-K 0.25 to 0.93
19
Thermal Expansion, µm/m-K 15 to 52
14

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
8.7

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 10
2.5
Stiffness to Weight: Bending, points 36 to 73
13
Strength to Weight: Axial, points 20 to 41
1.8
Strength to Weight: Bending, points 36 to 55
3.7
Thermal Diffusivity, mm2/s 0.1 to 0.51
13
Thermal Shock Resistance, points 34 to 57
7.2