Description and features

Enox YNE-85MO, 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexyne-3, is a yellow oily liquid which has C16H30O4 as chemical formula. This dialkyl peroxide is used as initiator for the (co)polymerization of styrene, besides it is used to crosslink polyethylene, natural rubbers and synthetic rubbers.

2,5-Dimethyl-2,5-di(tert-butylperoxy)hexyne-3 is also known as 2,5-bis(tert-butylperoxy)-2,5-dimethylhex-3-yne and 2,5-Di(tert-butylperoxy)-2,5-dimethyl-3-hexyne.


Europe: Enox YNE-85MO ➔ 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: 1068-27-5) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 1068-27-5
EC number 213-944-5
HS code 2909 60 00

Half-life data

Activation energy 38 kcal/mol
10 hr. half-life temp 131 °C
1 hr. half-life temp 152 °C
1 min. half-life temp 194 °C


Appearance Light yellow transparant liquid
Assay84.0 – 86.0 %
Active oxygen9.38 – 9.61 %
Color ≤ 100 Hazen
Hydroperoxide as C16H30O4  ≤2.0 %


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


Store 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexyne-3 in a cool, dry and well-ventilated area and in line with legal requirements. Keep Enox YNE-85MO 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 YNE-85MO 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 C16H30O4
Molecular weight 286.40 g/mol
Smiles notation O(OC(C)(C)C)C(C#CC(OOC(C)(C)C)(C)C)(C)C
Structural formula CAS: 1068-27-5

Physicochemical information

Boiling point Decomposes before boiling
Bulk density 0.883 g/cm3 @ 20 ºC
Flash point 69 ºC @ 1013 mBar
Partition coefficient (log Pow) 6.71 @ 25 ºC
Solubility in water 2.2 mg/l @ 20 ºC
Vapor pressure 0.014 Pa @ 20 ºC