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Formula: Os
Form: Powder
Material: Osmium
CAS Number: 7440-04-2
Commodity: Metals
Purity: 99.9%
Max Particle Size: 500μm
Hazard Pictogram: GHS02, GHS05, GHS07
Osmium powder is a highly dense, ductile metal powder. Available in 6 variations, it can be customized to meet the needs of many applications. The hardness and wear resistance of Osmium Powder means it is commonly used for electrical contacts and instrument pivot bearings. Its high density also allows it to be used as ballast for aircraft control and instrument gyroscopes. Osmium Powder’s properties make it ideal for the precision engineering of small components where high density is required.
Technical Data Sheet Safety Data Sheet Tolerance Properties

Flammable

Corrosive

Health hazard/Hazardous to the ozone layer

each

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Tolerances

Powder
Mean Particle Size Nominal
Minimum Particle Size Nominal
Maximum Particle Size Nominal
Maximum Particle Size Nominal
Particle Size D10 Nominal
Particle Size D50 Nominal
Particle Size D90 Nominal

Material Properties for Metals

Atomic Properties
Element Value
Atomic number 76
Crystal structure Hexagonal close packed
Electronic structure Xe 4f¹⁴ 5d⁶ 6s²
Valences shown 0, 1, 2, 3, 4, 5, 6, 7, 8
Atomic weight( amu ) 190.2
Thermal neutron absorption cross-section( Barns ) 15.3
Photo-electric work function( eV ) 4.8
Natural isotope distribution( Mass No./% ) 192/ 41.0
Natural isotope distribution( Mass No./% ) 184/ 0.02
Natural isotope distribution( Mass No./% ) 187/ 1.6
Natural isotope distribution( Mass No./% ) 189/ 16.1
Natural isotope distribution( Mass No./% ) 186/ 1.58
Natural isotope distribution( Mass No./% ) 188/ 13.3
Natural isotope distribution( Mass No./% ) 190/ 26.4
Atomic radius - Goldschmidt( nm ) 0.135
Ionisation potential( No./eV ) Feb-16
Ionisation potential( No./eV ) 1/ 8.7
Mechanical Properties
Element Value
Material condition Soft
Material condition Hard
Poisson's ratio 0.25
Poisson's ratio 0.25
Bulk modulus( GPa ) 373
Bulk modulus( GPa ) 373
Tensile modulus( GPa ) 559
Tensile modulus( GPa ) 559
Hardness - Vickers( kgf mm⁻² ) 300-350
Hardness - Vickers( kgf mm⁻² ) 670-1000
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 8.8@20@20°C
Superconductivity critical temperature( K ) 0.66
Temperature coefficient( K⁻¹ ) 0.0041@0-100°C
Physical Properties
Element Value
Boiling point( C ) 5027
Density( gcm⁻³ ) 22.5@20°C
Thermal Properties
Element Value
Melting point( C ) 3045
Latent heat of evaporation( J g⁻¹ ) 3305
Latent heat of fusion( J g⁻¹ ) 154
Specific heat( J K⁻¹ kg⁻¹ ) 131@25
Thermal conductivity( W m⁻¹ K⁻¹ ) 87.6@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 4.57@0-100

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