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C35000 Brass vs. 85-platinum 15-iridium

C35000 brass belongs to the copper alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. 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 C35000 brass and the bottom bar is 85-platinum 15-iridium.

UNS C35000 Leaded Brass85-Platinum 15-Iridium Electrical Contact Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Poisson's Ratio 0.31
0.38
Shear Modulus, GPa 40
81
Tensile Strength: Ultimate (UTS), MPa 340 to 650
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 170
110
Melting Completion (Liquidus), °C 920
1820
Melting Onset (Solidus), °C 890
1790
Specific Heat Capacity, J/kg-K 380
130
Thermal Expansion, µm/m-K 21
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 29
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.1
22

Common Calculations

Stiffness to Weight: Axial, points 7.1
5.7
Stiffness to Weight: Bending, points 19
9.3
Strength to Weight: Axial, points 12 to 22
7.1 to 9.3
Strength to Weight: Bending, points 13 to 21
6.9 to 8.3
Thermal Shock Resistance, points 11 to 22
21 to 28

Alloy Composition

Copper (Cu), % 60 to 63
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 0 to 0.1
0
Lead (Pb), % 0.8 to 2.0
0
Platinum (Pt), % 0
84.3 to 85.5
Zinc (Zn), % 34.5 to 39.2
0
Residuals, % 0
0 to 0.2