Iridium powder

Iridium powder

Product Name: Iridium powder


CAS: 7439-88-5
Molecular Formula: Ir
Molecular weight:192.2
Density: 22.56 g/cm3
Melting point:2446 °C
Boiling point:4130 °C
Purity: 99%,99.9%,99.95%,99.99%, 99.999%
Appearance: Gray -black solid

Electronegativity: 2.2 Paulings
Heat of Fusion : 41.12 kJ/mol
Heat of Vaporization: 564 kJ/mol
Poisson's Ratio: 0.26
Specific Heat: 133 J/kg ·K
Tensile Strength: 2000 MPa
Thermal Conductivity: 1.47 W/m ·K
Thermal Expansion: 6.4 µm/(m·K)
Vickers Hardness: 1760 MPa
Young's Modulus: 528 GPa


Iridium is the second-densest element (after osmium) and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flam/mable.  

Iridium ,a precious metal,has an appearance similar to platinum in that it is white,but with a slightly yellowish tint.It is the most corrosion-resistant metal known,is very hard,brittle,and has a low ductility,making it difficult to machine,form,or work.Its principle use is as a hardening agent for platinum,though it is frequently found in crucibles and other high temperature devices.

Use :The high melting point, hardness and corrosion resistance of iridium and its alloys determine most of its applications. Iridium and especially iridium–platinum alloys or osmium–iridium alloys have a low wear and are used, for example, for multi-pored spinnerets, through which a plastic polymer melt is extruded to form fibers, such as rayon.[57] Osmium–iridium is used for compass bearings and for balances.

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