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ASTM B617 Coin Silver vs. 85-platinum 15-iridium

Both ASTM B617 coin silver and 85-platinum 15-iridium are otherwise unclassified metals. 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 ASTM B617 coin silver and the bottom bar is 85-platinum 15-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
220
Elongation at Break, % 1.1 to 22
5.5 to 34
Poisson's Ratio 0.37
0.38
Shear Modulus, GPa 28
81
Shear Strength, MPa 180 to 290
370 to 420
Tensile Strength: Ultimate (UTS), MPa 290 to 520
560 to 730

Thermal Properties

Latent Heat of Fusion, J/g 120
110
Melting Completion (Liquidus), °C 870
1820
Melting Onset (Solidus), °C 780
1790
Specific Heat Capacity, J/kg-K 250
130
Thermal Expansion, µm/m-K 19
8.4

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 83
6.2
Electrical Conductivity: Equal Weight (Specific), % IACS 72
2.6

Otherwise Unclassified Properties

Density, g/cm3 10
22

Common Calculations

Stiffness to Weight: Axial, points 4.1
5.7
Stiffness to Weight: Bending, points 14
9.3
Strength to Weight: Axial, points 7.7 to 14
7.1 to 9.3
Strength to Weight: Bending, points 9.3 to 14
6.9 to 8.3
Thermal Shock Resistance, points 14 to 25
21 to 28

Alloy Composition


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Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Copper (Cu), % 9.0 to 10.4
0
Iridium (Ir), % 0
14.5 to 15.5
Iron (Fe), % 0 to 0.050
0
Lead (Pb), % 0 to 0.030
0
Nickel (Ni), % 0 to 0.010
0
Phosphorus (P), % 0 to 0.020
0
Platinum (Pt), % 0
84.3 to 85.5
Silver (Ag), % 89.6 to 91
0
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.060
0 to 0.2

Comparable Variants