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Description and features

Enox TBPB (tert-Butyl Peroxybenzoate) is yellowish liquid which has C11H14O3 as chemical formula. It is a low volatility, high purity, aromatic peroxyester. which is effective as medium temperature initiator for polymerization of a broad spectrum of monomers, per example acrylics, ethylene and styrene. It is also used to cure (copolymerization) unsaturated polyester resins at elevated temperatures. Further it is used as catalyst for crosslinking synthetic rubbers like EPR, EPDM and NBR. re.


Europe: Enox TBPB is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 25 KG PE drums.

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

This substance (CAS: 614-45-9) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 614-45-9
EC number 210-382-2
HS code 2916 39 90

Half-life data

Activation energy 33.0 kcal/mole
10 hr. half-life temp 105 °C
1 hr. half-life temp 125 °C
1 min. half-life temp 167 °C


Appearance Light yellow transparent liquid
Assay ≧98.50 %
Active oxygen≧ 8.12%
Color≤ 50 Hazen
Water content ≤ 2.0 %
Tert-butyl hydroperoxide ≤ 0.005%
(In)organic hydrolysable Cl ≤ 0.005%


Available packaging: 25 KG PE drums.
Special packaging is available on request.


Store tert-Butyl Peroxybenzoate in a cool, dry and well-ventilated area and in line with legal requirements.
Keep Enox TBPB away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for Enox TBPB 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 C11H14O3
Molecular weight 194.23 g/mol
Smiles notation CC(C)(C)OOC(=O)C1=CC=CC=C1
Structural formula 614-45-9

Physicochemical information

Boiling point 282.40 °C ± 9.00 °C
Density ± 1.059 g/cm3 @ 20 °C
Flash point 109.70 °C ± 12.80 °C
Melting point 9 °C – 11 °C
Partition coefficient (log Pow) 3.00 @ 25 °C
SADT 60 °C
Solubility in water Moderately soluble (210 -350 mg/l)
Vapour pressure 0.00337 Torr = 0.45 Pa @ 25 °C