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85-platinum 15-iridium vs. C68700 Brass

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while C68700 brass belongs to the copper alloys. There are 17 material properties with values for both materials. Properties with values for just one material (11, 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 85-platinum 15-iridium and the bottom bar is C68700 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Poisson's Ratio 0.38
0.32
Shear Modulus, GPa 81
41
Tensile Strength: Ultimate (UTS), MPa 560 to 730
390

Thermal Properties

Latent Heat of Fusion, J/g 110
190
Melting Completion (Liquidus), °C 1820
970
Melting Onset (Solidus), °C 1790
930
Specific Heat Capacity, J/kg-K 130
400
Thermal Expansion, µm/m-K 8.4
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.2
23
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
25

Otherwise Unclassified Properties

Density, g/cm3 22
8.3

Common Calculations

Stiffness to Weight: Axial, points 5.7
7.3
Stiffness to Weight: Bending, points 9.3
19
Strength to Weight: Axial, points 7.1 to 9.3
13
Strength to Weight: Bending, points 6.9 to 8.3
14
Thermal Shock Resistance, points 21 to 28
13

Alloy Composition

Aluminum (Al), % 0
1.8 to 2.5
Arsenic (As), % 0
0.020 to 0.1
Copper (Cu), % 0
76 to 79
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
0 to 0.060
Lead (Pb), % 0
0 to 0.070
Platinum (Pt), % 84.3 to 85.5
0
Zinc (Zn), % 0
17.8 to 22.2
Residuals, % 0
0 to 0.5