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6061 aluminum and PEEK belong to fundamentally different material chemistries. 6061 aluminum is a metal, while PEEK is a polymeric material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in material properties.

There are 9 properties with values for both materials. Properties with values for just one material (15 in this case) are not shown.

Density
g/cm3
2.70
1.32 to 1.51
Elastic Modulus
GPa
69
4 to 24
Elongation
%
6 to 22
1.3 to 50
Melting Onset
°C
582
340
Specific Heat
J/kg-K
900
1240 to 1700
Strength To Weight Ratio
kN-m/kg
48 to 144
70 to 161
Thermal Conductivity
W/m-K
150 to 180
0.25 to 0.93
Thermal Expansion
µm/m-K
23.4
15 to 48
Ultimate Tensile Strength
MPa
130 to 390
92 to 230