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C68300 Brass vs. 90-platinum 10-iridium

C68300 brass belongs to the copper alloys classification, while 90-platinum 10-iridium belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (13, 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 C68300 brass and the bottom bar is 90-platinum 10-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
200
Elongation at Break, % 15
5.5 to 34
Poisson's Ratio 0.31
0.38
Shear Modulus, GPa 40
74
Shear Strength, MPa 260
220 to 320
Tensile Strength: Ultimate (UTS), MPa 430
330 to 550

Thermal Properties

Latent Heat of Fusion, J/g 180
100
Specific Heat Capacity, J/kg-K 390
130
Thermal Expansion, µm/m-K 20
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.0
22

Common Calculations

Stiffness to Weight: Axial, points 7.3
5.3
Stiffness to Weight: Bending, points 20
9.1
Strength to Weight: Axial, points 15
4.2 to 7.1
Strength to Weight: Bending, points 16
4.9 to 6.9
Thermal Shock Resistance, points 14
13 to 22

Alloy Composition

Antimony (Sb), % 0.3 to 1.0
0
Cadmium (Cd), % 0 to 0.010
0
Copper (Cu), % 59 to 63
0
Iridium (Ir), % 0
9.5 to 10.5
Lead (Pb), % 0 to 0.090
0
Platinum (Pt), % 0
89.3 to 90.5
Silicon (Si), % 0.3 to 1.0
0
Tin (Sn), % 0.050 to 0.2
0
Zinc (Zn), % 34.2 to 40.4
0
Residuals, % 0
0 to 0.2