Description and features

Enox TMCH-90MO (1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane) is liquid substance which has C17H34O4 as chemical formula. It it used used for the (co)polymerization of styrene, acrylonitrile, acrylates and methacrylates in the temperature range between 90°C to 120 °C and for the polymerization of diethylene glycoldi(allycarbonate) based optical monomers. The use level of Enox TMCH-90MO will depend on the particular cure parameters being used.

1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane is also known as TMCH and 1,1-Bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.


Europe and United States: Provided Enox TMCH-90MO is on stock in our local warehouses our lead time is about one week if delivered in 20 KG PE drums.

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

  • Also available: Enox TMCH-50MO and Enox TMCH-75MO

This material (CAS: 6731-36-8) has been registered (FULL) under REACH (EC) 1907/2006.

Product Identification

CAS number 6731-36-8
EC number 229-782-3
HS code 2909 60 00

Half-life data

Activation energy 35.1 kcal/mol
10 hr. half-life temp 92 °C
1 hr. half-life temp 112 °C
1 min. half-life temp 155 °C


AppearanceColorless to light yellowish liquid
Assay89 -91 %
Active oxygen 9.31 – 9.52 %
Color ≤ 60 Hazen
TBHP ≤0.10 %
Carrier / solventIsododecane/ mineral oil/ ethyl benzene


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


Store 1-1-Di-tert-butylperoxy-3-3-5-trimethylcyclohexane in a cool, dry and well-ventilated area and in line with legal requirements.
Keep Enox TMCH-90MO away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for Enox TMCH-90MO 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 C17H34O4
Molecular weight 302.452 g/mol
Smiles notation O(OC(C)(C)C)C1(OOC(C)(C)C)C[C@@H](CC(C)(C)C1)C
Structural formula 6731-36-8

Physicochemical information

Density 0.910 g/cm3 @ 20 °C
Melting point -29 °C
Partition coefficient (log Pow) 6.92 @ 20 °C
SADT 60 °C
Solubility in water Insoluble (< 0.1 mg/l)
Vapour pressure 2 Pa @ 20 °C
Viscosity 35.5 mPa.s @ 20 °C
1-1-Di-tert-butylperoxy-3-3-5-trimethylcyclohexane | CAS: 6731-36-8 | 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.