Os
metal· Os
Osmium (Os) is a dense refractory metal belonging to the platinum group metals, characterized by exceptional hardness and resistance to corrosion and oxidation at elevated temperatures. It is employed in specialized high-performance applications where extreme durability and chemical inertness are critical, including electrical contacts in demanding environments, fountain pen nibs, and as a catalyst in chemical processing. Engineers select osmium when standard metals prove inadequate due to wear, corrosion, or thermal constraints, though its scarcity, cost, and brittleness typically limit its use to small components or alloy additions rather than bulk structural applications.
electrical contacts and switching systemscatalyst applicationswear-resistant tool tipshigh-temperature corrosion resistanceprecision instrument componentsplatinum group metal alloys
Compliance & Regulations
?EAR?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)2 entries | 58,207.8 | ksi | — | ||
| ↳ | 56,105 | ksi | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.01844 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | — | ||
Poisson's Ratio(ν)2 entries | 0.2347 | - | — | ||
| ↳ | 0.2500 | - | — | ||
Shear Modulus(G)2 entries | 37,520.7 | ksi | — | ||
| ↳ | 35,264.5 | ksi | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.7845 | lb/in³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 0.000 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | 0.1500 | µV/K | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | 0.1348 | eV/atom | — |
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
Export Control
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.