Platinum / Iridium Pt 90 / Ir 10 - Supplier Data by Goodfellow


Platinum / Iridium Pt 90 / Ir 10 alloy has been used in “non-standard” thermocouples, electrical contacts and for electrodes in medical research. The alloy is harder and mechanically stronger than Platinum.

Key Properties

The key properties of Platinum / Iridium Pt 90 / Ir 10 alloy are tabulated below.

Table 1. Key properties

Electrical Properties
Temperature coefficient ( K-1 ) 0.0013
Electrical resistivity ( µ ) 25
Mechanical Properties
Elongation at break ( % ) <25
Hardness - Brinell 130-190
Tensile strength ( MPa ) 380-620
Physical Properties
Density ( ) 21.56
Melting point (°C ) 1800
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 8.7 @ 20-100 °C
Thermal conductivity ( W.m-1.K-1 ) 31 @ 23 °C


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  1. John Chung John Chung Taiwan says:

    How to remove oxidation film from the part surface which made by Pt-10Ir alloy?

    We would like to know how soon a pure fresh surface on Pt-10Ir alloy made part would be oxidized if store in room ambient enviroment. In other words, does it have a self life of said surface?

    If we would like to keep the surface not be oxidized then what kinds of enviroment should be prepared for storage of Pt-10Ir made parts

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