Annealed 85-platinum 15-iridium vs. Annealed ASTM B685 Alloy

Both annealed 85-platinum 15-iridium and annealed ASTM B685 alloy are otherwise unclassified metals. Both are furnished in the annealed condition. There are 19 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is annealed 85-platinum 15-iridium and the bottom bar is annealed ASTM B685 alloy.

Annealed 85-Platinum 15-Iridium Alloy Annealed ASTM B685 Palladium-Copper Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		120

Elongation at Break, %		34
Elongation at Break, %		23

Poisson's Ratio		0.38
Poisson's Ratio		0.37

Shear Modulus, GPa		81
Shear Modulus, GPa		43

Shear Strength, MPa		370
Shear Strength, MPa		410

Tensile Strength: Ultimate (UTS), MPa		560
Tensile Strength: Ultimate (UTS), MPa		660

Thermal Properties

Latent Heat of Fusion, J/g		110
Latent Heat of Fusion, J/g		180

Melting Completion (Liquidus), °C		1820
Melting Completion (Liquidus), °C		1230

Melting Onset (Solidus), °C		1790
Melting Onset (Solidus), °C		1200

Specific Heat Capacity, J/kg-K		130
Specific Heat Capacity, J/kg-K		300

Thermal Expansion, µm/m-K		8.4
Thermal Expansion, µm/m-K		14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		6.2
Electrical Conductivity: Equal Volume, % IACS		5.0

Electrical Conductivity: Equal Weight (Specific), % IACS		2.6
Electrical Conductivity: Equal Weight (Specific), % IACS		4.1

Otherwise Unclassified Properties

Density, g/cm³		22
Density, g/cm³		11

Common Calculations

Stiffness to Weight: Axial, points		5.7
Stiffness to Weight: Axial, points		6.1

Stiffness to Weight: Bending, points		9.3
Stiffness to Weight: Bending, points		15

Strength to Weight: Axial, points		7.1
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		6.9
Strength to Weight: Bending, points		16

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		28

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.0050

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.050

Copper (Cu), %		0
Copper (Cu), %		39.5 to 40.5

Iridium (Ir), %		14.5 to 15.5
Iridium (Ir), %		0

Iron (Fe), %		0
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0
Lead (Pb), %		0 to 0.030

Palladium (Pd), %		0
Palladium (Pd), %		59 to 60.5

Platinum (Pt), %		84.3 to 85.5
Platinum (Pt), %		0

Silver (Ag), %		0
Silver (Ag), %		0 to 0.1

Zinc (Zn), %		0
Zinc (Zn), %		0 to 0.060

Residuals, %		0
Residuals, %		0 to 0.2