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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

Platinum (Pt)Pt 89.3 to 90.5
Iridium (Ir)Ir 9.5 to 10.5
Residualsres. 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