Description and features

Iniper DCP (dicumyl peroxide), is a white crystal which has C18H22O2 as chemical formula. This dialkyl peroxide is used for the (co)polymerization of styrene, besides it is used to crosslink polymers and elastomers. Further it finds its application as flame retardant synergist in EPS.

Dicumyl Peroxide is also known as Diisopropylbenzene peroxide, Bis(α,α-dimethylbenzyl) peroxide and Dicumene hydroperoxide.


Europe: Iniper DCP is ➔ on stock in our local warehouses. Our lead ime is about one week if delivered in 20 KG carton boxes.

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

This substance (CAS: 80-43-3) has been registered under REACH (EC) 1907/2006.

Product Identification

CAS number 80-43-3
EC number 201-279-3
HS code 2909 60 00

Half-life data

Activation energy 34.3 kcal/mol
10 hr. half-life temp 114 °C
1 hr. half-life temp 135 °C


AppearanceWhite crystal
Assay≥ 99.00 %
Active Oxygen≥ 5.86


Iniper DCP is used as crosslinking agent in the production of tires, hoses, wires & cables etc. Further it is used as flame retardant synergist in the production of expanded polystyrene (EPS) which will catalyze the flame retardant action in case of heating. Further it can be used for the (co)polymerization of styrene for temperatures between 110-165 ºCs.


Available packaging: 20 KG carton boxes.
Special packaging is available on request.


Store Dicumyl Peroxide in a cool, dry and well-ventilated area and in line with legal requirements. Keep Iniper DCP away from heat sources, avoid contact with acids, alkalines, heavy metal compounds and reducing agents. The Self Accelerating Decomposition Temperature (SADT) in original packaging is 75ºC.


A Material Safety Data Sheets (MSDS) is available for Iniper DCP 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 C18H22O2
Molecular weight 270.40 g/mol
Smiles notation CC(C)(C1=CC=CC=C1)OOC(C)(C)C2=CC=CC=C2
Structural formula Dicumyl peroxide

Physicochemical information

Boiling point: Decomposes before boiling
Bulk density 1.107 g/ml @ 20 ºC
Flash point 130.7 ºC @ 101 325 Pa
Partition coefficient (log Pow) 5.6 @ 25 ºC
Solubility in water 0.43 mg/l @ 20 ºC
Vapor pressure 0.001 Pa @ 25 ºC
Dicumyl peroxide | CAS:80-43-3 | 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.