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Description and features
Iniper 42S (Tert-butyl peroxy-3,5,5-trimethylhexanoate) is a clear liquid which has C13H26O3 as chemical formula. It is used as initiator in the production of acrylic polymers, polyethylene and styrene. Further it is applied as curing agent in the production of unsaturated polyester resins.

Tert-butyl peroxy-3,5,5-trimethylhexanoate is also known as TBPIN and tert-butyl 3,5,5-trimethylperoxyhexanoate.

Product information

CAS number13122-18-4
EC number 236-050-7
HS code2915 90 70

Molecular and structural weight

Molecular formulaC13H26O3
Molecular weight230.35 g/mol
Smiles notationCOOC(C)(CC(CC(=O)OC(C)(C)C)OOC)OOC
Structural formula13122-18-4


AppearanceClear liquid
Assay≥97.00 %
Hydro peroxide≤0.10 %
Water Content≤0.025 %
Density 0.893 @ 20 °C
Flash Point84.5 @ 20 °C
Ignition Temp460 @ 20 °C
SADT55 @ 20 °C

Half-life data

Activation energy140.78 (KJ/mole)
10 hr. half-life temp94 °C
1 hr. half-life temp114 °C
0.10 hr. half-life temp135 °C

Molecular and structural information

Density0.890 g/cm3 @ 20 °C
Flash point94 °C @ 1013.25 hPa
Melting point-69.15 °C
Partition coefficient (log Pow)4.40 @ 25 °C
Solubility in waterSlightly soluble (14.20 mg/l)
Vapour pressure0.03 mBar @ 30 °C
Viscosity5.0 mPa @ 20°C.

Available packaging 25 KG PE drum.
Special packaging is available on request

Shipment Info
Europe and United States: Provided Iniper 42S is on stock in our local warehouses our lead time is about one week if delivered in 25 KG drums.
Canada, South America, South Africa and other markets can also be served, please contact our sales department for more details.

Store Tert-butyl peroxy-3,5,5-trimethylhexanoate in a cool, dry and well-ventilated area and in line with legal requirements.
Keep away from heat sources and oxidizing agents.

This substance (CAS: 13122-18-4) has been pre-registered under REACH (EC) 1907/2006.

A Material Safety Data Sheets (MSDS) is available for Iniper 42S and all other products supplied by Vesta Intracon 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.

Tert-butyl peroxy-3,5,5-trimethylhexanoate: Disclaimer. This information is supplied solely for informational purposes and Vesta Intracon 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.