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C33000 Brass vs. 85-platinum 15-iridium

C33000 brass belongs to the copper alloys classification, while 85-platinum 15-iridium belongs to the otherwise unclassified metals. There are 19 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 C33000 brass and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 7.0 to 60
5.5 to 34
Poisson's Ratio 0.31
0.38
Shear Modulus, GPa 40
81
Shear Strength, MPa 240 to 300
370 to 420
Tensile Strength: Ultimate (UTS), MPa 320 to 520
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 180
110
Melting Completion (Liquidus), °C 940
1820
Melting Onset (Solidus), °C 900
1790
Specific Heat Capacity, J/kg-K 390
130
Thermal Expansion, µm/m-K 20
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 8.2
22

Common Calculations

Stiffness to Weight: Axial, points 7.2
5.7
Stiffness to Weight: Bending, points 19
9.3
Strength to Weight: Axial, points 11 to 18
7.1 to 9.3
Strength to Weight: Bending, points 13 to 18
6.9 to 8.3
Thermal Shock Resistance, points 11 to 17
21 to 28

Alloy Composition

Copper (Cu), % 65 to 68
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 0 to 0.070
0
Lead (Pb), % 0.25 to 0.7
0
Platinum (Pt), % 0
84.3 to 85.5
Zinc (Zn), % 30.8 to 34.8
0
Residuals, % 0
0 to 0.2