Annealed 90-Platinum 10-Iridium Alloy
Annealed 90-platinum 10-iridium is 90-platinum 10-iridium in the annealed condition. The graph bars on the material properties cards below compare annealed 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
34 %
Poisson's Ratio
0.38
Shear Modulus
74 GPa 11 x 106 psi
Shear Strength
220 MPa 31 x 103 psi
Tensile Strength: Ultimate (UTS)
330 MPa 47 x 103 psi
Other Material Properties
Density
22 g/cm3 1340 lb/ft3
Latent Heat of Fusion
100 J/g
Melting Completion (Liquidus)
1830 °C 3330 °F
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 points
Strength to Weight: Bending
4.9 points
Thermal Shock Resistance
13 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
Further Reading
ASTM B684: Standard Specification for Platinum-Iridium Electrical Contact Materials