Chemical name: Ethyltriphenylphosphonium Acetate
CAS number: 35835-94-0

product sheet

Description and Features
Catonium ETPAAC (Ethyltriphenylphosphonium Acetate) is a colourless to slightly yelow liquid, its chemical formula is C22H23O2P. ETPAAC is a quaternary phosphonium salt available in 70% by weight solution in methanol. One mole of acetic acid is bound to each mole of ETPAAC. The material is mainly used for the advancement and curing of phenolic based epoxy resins and as a phase transfer catalyst.

Ethyltriphnylphosphonium Acetate also known as ETPAAC, ETPAACc and TEPA.

Compared to amines, imidazoles and quaternary ammonium salts CatOnium ETPAAC features considerable better latency and thermal stability. Further it offers a low odor, minimal color formation and controlled reactivity.

It decreases or eliminates side reactions and creates longer, straighter chain epoxy molecules which have a sharp molecular weight distribution.

Product information

CAS number35835-94-0
EC number 252-743-7
HS code2931 39 90

Molecular and structural information

Molecular formulaC22H23O2P
Molecular weight350.39 g/mol
Smiles notationCC[P+](C1=CC=CC=C1)(C2=CC=CC=C2)C3=CC=CC=C3.CC(=O)[O-]
Structural formula:5717-37-3


AppearanceColourless to slightly yellow liquid
Assay≥65 - 70 %
Triphenyl phosphine≤0.50 %
Cl≤1.00 %

Physicochemical information

Boiling point: 63 ºC
Density1.05 g/ml
pH6.0 - 8.0
SolubilitySoluble in alcohol

CatOnium ETPAAC (Ethyltriphenylphosphonium Acetate) is applied in the production of epoxy resins and as pase transfer catalyst.

Available packaging: 200 KG drums.
Special packaging is available on request.

Shipment Info
CatOnium ETPAAC is on stock the United States. Our lead time is about one week if delivered in 20 KG fiber drums.
Europe, Canada other markets can also be served, please contact our sales department for more details.

Store Ethyltriphenylphosphonium Acetate in a cool, dry and well-ventilated area and in line with legal requirements.
Keep ETPAAC away from heat sources and oxidizing agents

This substance (CAS: 35835-94-0) has been pre-registered under REACH (EC) 1907/2006.

A Material Safety Data Sheets (MSDS) is available for CatOnium ETPAAC and all other products supplied by Vesta Intracon BV. An MSDS describes the hazards of a product and explains how a product can be safely handled, used and stored. Besides it provides important regulatory and emergency response information for the purchased product.

Ethyltriphenylphosphonium Acetate: Disclaimer. This information is supplied solely for informational purposes and Vesta Intracon bv makes no guarantees or warranties, either expressed or implied, with respect to the accuracy and use of this data. All product warranties and guarantees shall be governed by the Standard Terms of Sale. Nothing in this document is legal advice or is a substitute for competent legal advice.