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Description and features

Catonium TPPBr (Tetraphenylphosphonium Bromide) is a white to off-white, its chemical formula is C24H20BrP. TPPBr is a quaternary phosphonium salt mainly used in  pharmaceuticals, as accelarator for fluoroelastomers , adhesion promotor for fluoroelastomers and curative of polyacrylate polymers which extends the shelf life of the compound and decreases the mould fouling.  This material is highly soluble in water and slightly soluble in alcohols.

Tetraphenylphosphonium Bromide is also known as TPP, TPP-Br, TPPB and TPPBr.

Compared to amines, imidazoles and quaternary ammonium salts CatOnium TPPBr features considerable better latency and thermal stability.

Further it offers a low odor, minimal color formation and controlled reactivity.


Europe and United States: Provided CatOnium TPPBr is on stock in our local warehouses our lead time is about one week if delivered in 25 KG drums.

Canada,  South America,  South Africa and other markets can also be served, please contact our sales department for more details.

Limited available in the European Union (< 1.000 KG) as this product has not been REACH registered. ➔  Registration in progress.

Product Identification

CAS number2751-90-8
EC number220-393-4
HS code2931 39 00


Appearance White to off white powder
Assay≥ 99.00 %
Loss on drying ≤ 1.00 %
Triphenyl phosphine ≤ 0.50 %


CatOnium TPPBr (Tetraphenylphosphonium Bromide) is applied in  fluoroelastomers and polyacrylate polymers.


Available packaging: 20 KG fiber drums.
Special packaging is available on request.


Store Tetraphenylphosphonium Bromide in a cool, dry and well-ventilated area and in line with legal requirements.
Keep TPPBr away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for CatOnium TPPBr and all other products supplied by Vesta Chemicals 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.

Molecular and structural information

Molecular formula
Molecular weight419.29 g/mol
Chemical formula tetraphenylphosphonium bromide

Physicochemical information

Boiling point457.77 ºC
Flash point> 260 ºC
Melting point294 – 297 °C
Log Kow5.28
Solubility in waterSoluble @ 20 ºC
Vapor pressure 4.2E-005 Pa
Tetrapropylammonium Bromide | CAS: 1941-30-6 | Disclaimer. This information is supplied solely for informational purposes and Vesta Chemicals 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.