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Description and features

Enox 101 (2-5-Dimethyl-2-5-di-tert-butylperoxy-hexane) is a yellowish liquid which has C16H34O4 as chemical formula. It is used to cure polymers and elastomers, mainly polyethylene ( LDPE, HDPE),  ethylene propylene diene monomer (EPDM), sillicone rubber and fluoroelastomers. Further it acts as initiator for the production of controlled rheology polypropylene (CR-PP).

2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane is also known as di-tert-butyl 1,1,4,4-tetramethyltetramethylene diperoxide, 2,5-Dimethyl-2,5-bis(tert-butylhydroperoxy)hexane and Di-tert-butyl 1,1,4,4-tetramethyltetramethylene diperoxide.


Europe: Enox 101 (DHBP) ➔ 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 product (CAS: 78-63-7) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number78-63-7
EC number201-128-1
HS code2909 60 00

Half-life data

Activation energy 36.0 kcal/mole
10 hr. half-life temp 118 °C
1 hr. half-life temp 138 °C
1 min. half-life temp 177 °C


Appearance yellowish transparent liquid
Assay ≥94.00 %
Color ≤60
TBA≤0.50 %
DTBP≤0.50 %
Cyclig (TMDOCH) ≤5.00 %
DHBBP/mono ≤1.00 %
Fe mg/kg ≤1


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


Store 2,5-Dimethyl-2,5-di-tert-butylperoxy-hexane in a cool, dry and well-ventilated area and in line with legal requirements.
Keep Enox 101 away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for Enox 101 (DHBP) 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 C16H34O4
Molecular weight 290.44 g/mol
Smiles notation CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C
Structural formula:

Physicochemical information

Boiling point 306.50 °C ± 25 °C @ 760Torr.
Density 0.872 g/cm3 @ 20 °C
Flash point 68 ºC
Partition coefficient (log Pow) 7.34
Melting point 8 °C @ 1 atm
Refractivity 1.420 – 1.425
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure 0.185 Pa @ 25°C
Viscosity 7.35 mPa.s @ 12 rpm (20°C)