85-platinum 15-iridium vs. Grade 1 Babbitt Metal

Both 85-platinum 15-iridium and grade 1 Babbitt Metal are otherwise unclassified metals. There are 14 material properties with values for both materials. Properties with values for just one material (15, 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 85-platinum 15-iridium and the bottom bar is grade 1 Babbitt Metal.

85-Platinum 15-Iridium Electrical Contact Alloy Grade 1 (L13910) Tin-Base Babbitt Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		53

Elongation at Break, %		5.5 to 34
Elongation at Break, %		34

Poisson's Ratio		0.38
Poisson's Ratio		0.35

Shear Modulus, GPa		81
Shear Modulus, GPa		20

Thermal Properties

Latent Heat of Fusion, J/g		110
Latent Heat of Fusion, J/g		70

Melting Completion (Liquidus), °C		1820
Melting Completion (Liquidus), °C		370

Melting Onset (Solidus), °C		1790
Melting Onset (Solidus), °C		220

Specific Heat Capacity, J/kg-K		130
Specific Heat Capacity, J/kg-K		230

Thermal Expansion, µm/m-K		8.4
Thermal Expansion, µm/m-K		21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		6.2
Electrical Conductivity: Equal Volume, % IACS		13

Electrical Conductivity: Equal Weight (Specific), % IACS		2.6
Electrical Conductivity: Equal Weight (Specific), % IACS		16

Otherwise Unclassified Properties

Density, g/cm³		22
Density, g/cm³		7.3

Common Calculations

Stiffness to Weight: Axial, points		5.7
Stiffness to Weight: Axial, points		4.0

Stiffness to Weight: Bending, points		9.3
Stiffness to Weight: Bending, points		17

Alloy Composition

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

Antimony (Sb), %		0
Antimony (Sb), %		4.0 to 5.0

Arsenic (As), %		0
Arsenic (As), %		0 to 0.1

Bismuth (Bi), %		0
Bismuth (Bi), %		0 to 0.080

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

Copper (Cu), %		0
Copper (Cu), %		4.0 to 5.0

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

Iron (Fe), %		0
Iron (Fe), %		0 to 0.080

Lead (Pb), %		0
Lead (Pb), %		0 to 0.35

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

Tin (Sn), %		0
Tin (Sn), %		89.3 to 92

Zinc (Zn), %		0
Zinc (Zn), %		0 to 0.0050

Residuals, %		0 to 0.2
Residuals, %		0