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C81400 Copper vs. 85-platinum 15-iridium

C81400 copper belongs to the copper alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (12, 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 C81400 copper and the bottom bar is 85-platinum 15-iridium.

UNS C81400 (Alloy 70C) Beryllium Copper85-Platinum 15-Iridium Electrical Contact Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
220
Elongation at Break, % 11
5.5 to 34
Poisson's Ratio 0.34
0.38
Shear Modulus, GPa 41
81
Tensile Strength: Ultimate (UTS), MPa 370
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 210
110
Melting Completion (Liquidus), °C 1090
1820
Melting Onset (Solidus), °C 1070
1790
Specific Heat Capacity, J/kg-K 390
130
Thermal Expansion, µm/m-K 17
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 60
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 61
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.9
22

Common Calculations

Stiffness to Weight: Axial, points 7.3
5.7
Stiffness to Weight: Bending, points 18
9.3
Strength to Weight: Axial, points 11
7.1 to 9.3
Strength to Weight: Bending, points 13
6.9 to 8.3
Thermal Shock Resistance, points 13
21 to 28

Alloy Composition

Beryllium (Be), % 0.020 to 0.1
0
Chromium (Cr), % 0.6 to 1.0
0
Copper (Cu), % 98.4 to 99.38
0
Iridium (Ir), % 0
14.5 to 15.5
Platinum (Pt), % 0
84.3 to 85.5
Residuals, % 0
0 to 0.2