Description and features

Iniper 117 (Tert butyl peroxy 2-ethylhexyl monocarbonate) is a clear liquid which has C13H26O4 as chemical formula. It is mainly used as radical initiator to induce polymerization for the production of EPS (expanded polystyrene), ethylene, acrylates and methacrylates. Further it is used for the crosslinking of natural and synthetic rubbers as well as thermoplastic elastomers. Lastly it is used for the curing of unsaturated polyester resins at elevated temperatures.


Europe: Iniper 117 (TBEHC) is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 10 KG, 16 KG or 25 KG PE drums.

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

This substance (CAS: 34443-12-4) has been registered (FULL substance) under REACH (EC) 1907/2006.

Product Identification

CAS number 34443-12-4
EC number 252-029-5
HS code 2920 90 10

Half-life data

Activation energy 151.72 kcal/mol
10 hr. half-life temp 99 °C
1 hr. half-life temp 119.3 °C
0.1 hr. half-life temp 161.4 °C


Appearance Colorless liquid
Assay ≥96.0 %
Active oxygen ≥6.23 %
Chloride <0.10 %
HPO<0.20 %


Available packaging: 10 KG, 16 KG, 16.50 KG and 25 KG PE drums.
Special packaging is available on request.


Store Tert butyl peroxy 2-ethylhexyl monocarbonate in a cool, dry and well-ventilated area and in line with legal requirements.
Keep Iniper 117 away from heat sources and oxidizing agents.


A Material Safety Data Sheets (MSDS) is available for Iniper 117 (TBEHC) 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 C13H26O4
Molecular weight 246.30 g/mol
Smiles notation CCCCC(CC)COC(=O)OOC(C)(C)C
Structural formula

Physicochemical information

Density 0.972 g/cm3 @ 20 °C
Flash point 100 °C, ± 1 °C @ 101.3 kPa
Melting point -90 °C, ±25 °C
Partition coefficient (log Pow) 5.55
SADT 65 °C
Solubility in water Slightly soluble (5.39 mg/l)
Vapour pressure 0.57 Pa @ 25 °C
Tert butyl peroxy 2-ethylhexyl monocarbonate | CAS: 34443-12-4 | 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.