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ASTM B631 Class B vs. 85-platinum 15-iridium

Both ASTM B631 class B and 85-platinum 15-iridium are otherwise unclassified metals. There are 12 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class B and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Poisson's Ratio 0.31
0.38
Shear Modulus, GPa 78 to 79
81

Thermal Properties

Latent Heat of Fusion, J/g 150
110
Melting Completion (Liquidus), °C 2460 to 2480
1820
Specific Heat Capacity, J/kg-K 170
130
Thermal Expansion, µm/m-K 12
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 50 to 53
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 32 to 34
2.6

Otherwise Unclassified Properties

Density, g/cm3 14
22

Common Calculations

Stiffness to Weight: Axial, points 8.1
5.7
Stiffness to Weight: Bending, points 14
9.3