Description and features

Iniper MAI (Dimethyl 2,2′-azobis(2-methylpropionate)) is an white solid which has C10H18N2O4 as chemical formula. Iniper MAI is used as polymerization in the production of polyols and polyester polyols, it is a non-nitrile azo-initiator which is soluble in a wide variety of organic solvents.

This substance is also known as 2,2-Azobisisobutyric acid dimethyl ester and Dimethyl 2,2′-(diazene-1,2-diyl)bis(2-methylpropanoate).


Europe: Iniper MAI ( Dimethyl 2,2′-azobis(2-methylpropionate) is
on stock in our local warehouses. Our lead time is about one week if delivered in 20KG carton boxes.

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

➔ Limited available in the European Union as this product has not been REACH registered (yet).

Product Identification

CAS number2589-57-3
EC number 219-976-6
HS code 2927 00 00
IUPAC name Dimethyl 2,2′-Azobis(2-methylpropionate)


AppearanceLight yellow or dark-white crystal granules
Assay≥98.00 %
Fe≤ 500 ppm
MMA (HPLC) ≤0.80 %
Water ≤1.00 %


Iniper MAI (Dimethyl 2,2-azobis(2-methylpropionate)) is used in polyols & polymer polyols.


Available packaging: 20 KG carton boxes.
Special packaging is available on request.


Store Dimethyl 2,2′-azobis(2-methylpropionate) (MAI) in a cool, dry and well-ventilated area and in line with legal requirements at maximum 10 °C.
Keep away from heat sources, ignition sources. Do not seal container gastight.


A Material Safety Data Sheets (MSDS) is available for Iniper MAI 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 C10H18N2O4
Molecular weight 230.26 g/mol
Smiles notation CC(C)(C(=O)OC)N=NC(C)(C)C(=O)OC
Structural formula Chemical name: Dimethyl 2,2'-azobis(2-methylpropionate) CAS number: 2589-57-3

Physicochemical information

Boiling point Decomposes before boiling
Density 1.060 kg/m3
Melting point 22 – 28 °C
Partition coefficient (log Pow) 1.34 @ 20 °C
Solubility in water Insoluble
Vapor pressure 0.0244 mmHg @ 25 °C
Dimethyl-2-2-azobis-2-methylpropionate | CAS: 2589-57-3 . 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.