Description and features
Catonium ETPI (Ethyltriphenylphosphonium Iodide) is a white to off-white crystalline powder with the chemical formula C20H20P. Mainly used for advancing and curing phenolic-based epoxy resins and thermosetting powder coatings, ETPI serves as a quaternary phosphonium salt. It also acts as a Wittig reagent in organic synthesis and as a phase transfer catalyst in producing fluoroelastomers. Highly soluble in water and polarizable solvents, Ethyltriphenylphosphonium Iodide is known as ETPI, ETPPI, and TPEP-I.
Compared to amines, imidazoles, and quaternary ammonium salts, CatOnium ETPI offers much better latency and thermal stability. It provides low odor, minimal color formation, and controlled reactivity. Additionally, it decreases or eliminates side reactions and creates longer, straighter chain epoxy molecules with a sharp molecular weight distribution.
Availability
Europe and United States: Provided CatOnium ETPI is in stock in our local warehouses our lead time is about one week if delivered in 25 KG drums.
We can also serve Canada, South America, South Africa, and other markets. Please contact our sales department for more details.
➔ Limited availability in the European Union as this product has not been REACH registered (yet).
Product Identification
| CAS number | 4736-60-1 |
| EC number | 225-245-2 |
| HS code | 2931 39 90 |
| Sensitivity | Hygroscopic |
Specification
| Appearance | White to off crystal powder |
| Assay | ≥ 99.00 % |
| Loss on drying | ≤0.20 % |
| Triphenyl phosphine | ≤ 0.50 % |
Application
CatOnium ETPI (Ethyltriphenylphosphonium Iodide) is being used in fluoroelastomers, thermosetting powder coatings and phenolic based epoxy resins.
Packaging
Available packaging: 25 KG.
Special packaging is available on request.
Storage
MSDS
A Material Safety Data Sheet (MSDS) is available for CatOnium ETPI and all other products supplied by Vesta Chemicals BV.
An MSDS outlines the hazards of a product and explains how to handle, use, and store the product safely. Besides it provides important regulatory and emergency response information for the purchased product.
Molecular and structural information
| Molecular formula | C20H20IP |
| Molecular weight | 418.26 g/mol |
| Smiles notation | [P+](c1ccccc1)(c1ccccc1)(c1ccccc1)CC.[IH-] |
| InChi key | SLAFUPJSGFVWPP-UHFFFAOYSA-M |
| Chemical formula |  |
Physicochemical information
| Boiling point | > 360 ºC |
| Relative density @ 20 ºC | 1.47 g/cm3 |
| Flash point | Not tested |
| Melting point | 170 °C |
| Partition coefficient (log Pow) | 0.324 @ 25 ºC |
| Solubility in water | 7.84 g/L (20.1O ºC) |
| Vapor pressure | 0 Pa @ 25 ºC |