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7075 Aluminum vs. RPU

7075 aluminum and RPU belong to fundamentally different material chemistries. 7075 aluminum is a metal, while RPU is a polymeric material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 13 material properties with values for both materials. Properties with values for just one material (25, 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 7075 aluminum and the bottom bar is RPU.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
2.2
Elongation at Break, % 1.8 to 12
90
Tensile Strength: Ultimate (UTS), MPa 240 to 590
60

Thermal Properties

Specific Heat Capacity, J/kg-K 870
1750
Thermal Conductivity, W/m-K 130
0.19
Thermal Expansion, µm/m-K 23
63

Otherwise Unclassified Properties

Density, g/cm3 3.0
1.2

Common Calculations

Stiffness to Weight: Axial, points 13
1.0
Stiffness to Weight: Bending, points 46
36
Strength to Weight: Axial, points 22 to 54
14
Strength to Weight: Bending, points 28 to 52
28
Thermal Diffusivity, mm2/s 50
0.090
Thermal Shock Resistance, points 10 to 25
31