Osmium tetraoxide ≥99.95%, crystalline, highest purity

Supplier: Electron Microscopy Sciences
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Osmium tetraoxide ≥99.95%, crystalline, highest purity
Osmium tetraoxide

Small size (2 ml), light-gauge, pre-scored amber glass ampoules containing OsO₄ crystal, are pre-cleaned and heat sealed in plastic bags to assure a contaminant-free solution.


Ampoules are also free of pressure-sensitive labels and, therefore, do not require cleaning prior to solution preparation.


Solubility 25.0% in CCl4
Solubility in water: 5.07% in Cold Water; 6.5% in Hot Water; Moderately sol. (7 g/100 mL)

Formula: O₄Os
Boiling Pt: 130 °C
Melting Pt: 40.1 °C
Density: 4.906 g/cm³ (22°C)
Storage Temperature: Ambient
MDL Number: MFCD00011150
CAS Number: 20816-12-0
UN: 2471
ADR: 6.1,I

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Specification Test Results

Vapor Pressure at 25 °C 9.8 mmHg
Osmium Purity >99.95%
Non-Volatile Matter <0.02%

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