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Grade: Casting Grain
Formula: Ir
Form: Pellet/Lump
Material: Iridium
CAS Number: 7439-88-5
Commodity: Precious Metals
Purity: 99.9%
Maximum Lump Size: 15mm

Iridium Pellets Casting Grain

Iridium Casting Grains combine exceptional corrosion resistance, extreme melting point, and mechanical durability in small granulated form designed for controlled melting and alloying. These grains are valued in industries such as aerospace, catalysis, and advanced electronics, where precise dosing and reproducible melting behavior are required. Applications include crucible fabrication for high-temperature processes, catalyst preparation for ammonia oxidation, and alloying with platinum-group metals to enhance hardness or oxidation resistance. Specific technologies benefiting include crystal growth furnaces, aerospace engine component development, and chemical reactor linings. Research uses include alloy microstructure studies, nanoparticle synthesis, and testing of iridium’s behavior under rapid thermal cycling. The granular form ensures efficient melting, uniform distribution, and scalability from laboratory to industrial systems. Its combination of purity, durability, and adaptability makes iridium casting grains indispensable for advancing high-performance materials and extreme-environment technologies.
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Tolerances

Pellets
Maximum Lump Size Nominal

Material Properties for Precious Metals

Atomic Properties
Element Value
Atomic number 77
Crystal structure Face centred cubic
Electronic structure Xe 4f¹⁴ 5d⁷ 6s²
Valences shown 3, 4
Atomic weight( amu ) 192.22
Thermal neutron absorption cross-section( Barns ) 425
Photo-electric work function( eV ) 4.6
Natural isotope distribution( Mass No./% ) 191/ 37.3
Natural isotope distribution( Mass No./% ) 193/ 62.7
Atomic radius - Goldschmidt( nm ) 0.135
Mechanical Properties
Element Value
Material condition Soft
Material condition Hard
Poisson's ratio 0.26
Poisson's ratio 0.26
Bulk modulus( GPa ) 371
Bulk modulus( GPa ) 371
Tensile modulus( GPa ) 528
Tensile modulus( GPa ) 528
Hardness - Vickers( kgf mm⁻² ) 650
Hardness - Vickers( kgf mm⁻² ) 200-300
Tensile strength( MPa ) 550-1100
Tensile strength( MPa ) 1200
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 5.1@20@20°C
Superconductivity critical temperature( K ) 0.11
Temperature coefficient( K⁻¹ ) 0.0045@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV ) 0.65
Physical Properties
Element Value
Boiling point( C ) 4130
Density( gcm⁻³ ) 22.4@20°C
Thermal Properties
Element Value
Melting point( C ) 2410
Latent heat of evaporation( J g⁻¹ ) 3186
Latent heat of fusion( J g⁻¹ ) 135
Specific heat( J K⁻¹ kg⁻¹ ) 133@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 147@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 6.8@0-100°C

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