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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.

Product information

CAS number614-45-9
EC number 210-382-2
HS code2916 39 90

Molecular and structural information

Molecular formulaC11H14O3
Molecular weight194.23 g/mol
Smiles notationCC(C)(C)OOC(=O)C1=CC=CC=C1
Structural formula:614-45-9


AppearanceLight yellow transparent liquid
Assay98.50 %
Fe≤0.0005 %
Water content≤0.20 %
Acidity≤0.05 %
TBHP≤0.10 %

Half-life data

Activation energy33 kcal/mole
10 hr. half-life temp105 °C
1 hr. half-life temp125 °C
1 min. half-life temp167 °C

Physicochemical information

Boiling point282.40 °C ± 9.00 °C
Density± 1.059 g/cm3 @ 20 °C
Flash point109.70 °C ± 12.80 °C
Melting point9 °C - 11 °C
Partition coefficient (log Pow)3.00 @ 25 °C
Solubility in waterModerately soluble (210 -350 mg/l)
Vapour pressure0.00337 Torr = 0.45 Pa @ 25 °C

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

Shipment Info
Europe and United States: Provided Enox TBPB 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.

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.

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

A Material Safety Data Sheets (MSDS) is available for Enox TBPB 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.

Tert-Butyl Peroxybenzoate: 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.