Description and features

Enox PMBP, di-4-methylbenzoyl-peroxide is a white paste in silicon oil which has C16H14O4 as chemical formula. This diacyl peroxide is mainly used for the crosslinking of silicone rubbers.

Di(4-methylbenzoyl)peroxide is also known as p-Toluoyl peroxide and 4-methylbenzoyl peroxide


Europe: Enox PMBP is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 20 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: 895-85-2) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 895-85-2
EC number 407-950-9
HS code 2916 39 00

Half-life data

Activation energy 30.0 kcal/mol
10 hr. half-life temp 70 °C
1 hr. half-life temp 89 °C
1 min. half-life temp 130 °C


Appearance White paste
Assay 49.00 – 52.00 %
Active oxygen content 2.90 – 3.08 %
Free chlorine ≤0..05 %
Acidity as 4-methylbenzoic acid≤0.50 %
Volatile matter≤1.50 %


Enox PMBP is mainly used for the crosslinking of silicone rubbers, the compounds can be cured at atmospheric pressure in continuous systems with hot air and or IR-vulcanization. No scorching occurs at temperatures below 80 ºC, the paste makes it easier to mix the substance.


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


Store di-4-methylbenzoyl-peroxide below 25ºC in a cool, dry and well-ventilated area and in line with legal requirements. Keep Enox PMBP 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 80ºC.


A Material Safety Data Sheets (MSDS) is available for Enox PMBP 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 C16H14O4
Molecular weight 270.30 g/mol
Smiles notation CC1=CC=C(C=C1)C(=O)OOC(=O)C2=CC=C(C=C2)C
Structural formula 895-

Physicochemical information

Boiling pointDecomposes before boiling
Bulk density 1.22 kg/m3 @ 20 ºC
Flash point Decomposes before flash point
Melting point 101 325 Pa @ 134 ºC
Partition coefficient (log Pow) 4.70 @ 20 ºC
Solubility in water 0.043 mg/l (20 ºC)
Vapor pressure 0.01 Pa @ 25 ºC