90-Platinum 10-Iridium Electrical Contact Alloy
90-platinum 10-iridium is a precious metal alloy formulated for use in electrical contacts. It has a moderately high density among the precious metal electrical contact alloys in the database.
The properties of 90-platinum 10-iridium include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 90-platinum 10-iridium to: precious metal electrical contact alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
200 GPa 30 x 106 psi
Elongation at Break
5.5 to 34 %
Poisson's Ratio
0.38
Shear Modulus
74 GPa 11 x 106 psi
Shear Strength
220 to 320 MPa 31 to 46 x 103 psi
Tensile Strength: Ultimate (UTS)
330 to 550 MPa 47 to 79 x 103 psi
Other Material Properties
Density
22 g/cm3 1340 lb/ft3
Latent Heat of Fusion
100 J/g
Specific Heat Capacity
130 J/kg-K 0.032 BTU/lb-°F
Thermal Expansion
8.6 µm/m-K
Common Calculations
Stiffness to Weight: Axial
5.3 points
Stiffness to Weight: Bending
9.1 points
Strength to Weight: Axial
4.2 to 7.1 points
Strength to Weight: Bending
4.9 to 6.9 points
Thermal Shock Resistance
13 to 22 points
Alloy Composition
Pt | 89.3 to 90.5 | |
Ir | 9.5 to 10.5 | |
res. | 0 to 0.2 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B684: Standard Specification for Platinum-Iridium Electrical Contact Materials