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China (Mainland)
Business Type:Trading Company
Tel: 18954221560
Mobile: 18954221560
Tel: 18954221560
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URL: http://www.eastchem-cn.com
Province/state: Shangdong
City: Qingdao
Street: No.1581-12,Jinshui Road, Licang, Qingdao,China
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CAS NO.78-50-2 
COA/MSDN
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Product Name: Trioctylphosphine oxide (from factory East Chemsources-best price)CAS No.: 78-50-2EC No.: 201-121-5Molecular Formula: C??H??OPMolecular Weight: 386.64 g/molSupplier: East ChemsourcesRevision Date: 2026-02-04Version: V1.0
| Item | Specification |
|---|---|
| Synonyms | TOPO; Tri-n-octylphosphine oxide; Trioctylphosphane oxide |
| Appearance | White crystalline solid |
| Grade | Industrial Grade / High Purity Grade |
| Main Usage | Metal extractant for hydrometallurgy; organic synthesis catalyst; ligand for chemical reactions; solvent for rare metal separation |
| Property | Typical Value |
|---|---|
| Melting Point (°C) | 52-55 |
| Boiling Point (°C) | 210-215 (1.33 kPa) |
| Flash Point (°C, closed cup) | >110 |
| Density (25°C, g/cm³) | 0.880 (molten state) |
| Solubility | Insoluble in water; soluble in ethanol, toluene, xylene, chloroform, kerosene and other organic solvents |
| Stability | Stable under normal temperature and pressure; avoid strong oxidants, strong acids and high temperature |
| Refractive Index (55°C) | 1.458 |
| Test Item | Industrial Grade | High Purity Grade | Test Method |
|---|---|---|---|
| Purity (GC, %) | ≥98.0 | ≥99.0 | Gas Chromatography |
| Melting Range (°C) | 50-55 | 52-55 | Melting Point Apparatus |
| Moisture (%, KF) | ≤0.5 | ≤0.1 | Karl Fischer Titration |
| Ash Content (%) | ≤0.1 | ≤0.05 | Gravimetric Method |
| Heavy Metals (as Pb, ppm) | ≤50 | ≤10 | Atomic Absorption Spectroscopy |
This TDS is prepared based on current test data and production standards of East Chemsources, for reference only. East Chemsources does not warrant the suitability of the product for all specific applications. Users shall verify the product compatibility in their own processes and comply with relevant national and local regulations. East Chemsources guarantees batch quality in accordance with the above specifications.
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Founded in 2008, we are a fully integrated enterprise specializing in the research, development and manufacturing of chemical products. Over the past 15 years+, leveraging continuous technological innovation and strategic talent acquisition, we have experienced robust growth and emerged as a modern, internationalized and diversified chemical conglomerate. Presently, our product portfolio spans four core categories – food additives, pharmaceutical raw materials, specialty chemicals and personal care ingredients – with a global footprint covering more than 80 countries and regions worldwide.
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Regardless of your project scale or scope of service requirements – spanning a single business segment, multiple domains or our full suite of capabilities – our unwavering commitment to delivering premium-quality outcomes remains consistent. We eagerly anticipate forging mutually beneficial partnerships with you
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