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Description and features

Iniper 64 (Azobisisobutyronitrile or AIBN) is an white solid which has C8H12N4 as chemical formula. Iniper 64 is used as initiator predominantly for bulk, solution, suspension and emulsion polymerisation of a wide variety of monomers. Polymers produced in this way are used for different applications such as fibres, sheets, coating resins flocculants etc. The polymerisation of the monomers used is initiated by the free cyano-isopopyl radicals which are formed upon thermal decomposition of Iniper 64. It does not form oxygenated residues as it is the case with peroxides and does not cause oxidative degradation of pigmented or dyed polymer compositions such as paints, coatings, fibres and sheets.


Europe: Iniper 64 (AIBN) is ➔ on stock in our local warehouses. Our lead time is about one week if delivered in 20 KG fiber drums.

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

This substance (CAS: 78-67-1) has been registered under REACH (EC) 1907/2006.

Product Identification

CAS number78-67-1
EC number 201-132-3
EC name 2,2′-dimethyl-2,2′-azodipropiononitrile
HS code2927 00 00


Appearance White crystal powder / granules
Assay≥99.00 %
Methanol insoluble≤0.01 %
Volatile matter≤0.10 %
Water content ≤0.50 %


Iniper 64 (2,2′-Azobisisobutyronitrile) can be used for polymerization of methyl methacrylate, acrylics (coating), acrylamide, vinyl acetate, styrene and vinyl chloride.


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


Store azobisisobutyronitrile (AIBN) in a cool, dry and well-ventilated area and in line with legal requirements.
Keep away from heat sources, ignition sources.


A Material Safety Data Sheets (MSDS) is available for Iniper 64 (AIBN) 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 C8H12N4
Molecular weight 164.21 g/mol
Smiles notationCC(C)(C#N)N=NC(C)(C)C#N
Structural formula78-67-1 | AIBN

Physicochemical information

Boiling point Decomposes before boiling
Density 1.098 kg/m3 @ 22.60 °C
Melting point 105 °C
Partition coefficient (log Pow) 2.87 @ 20 °C
Solubility in water Insoluble (< 0.10 mg/l)
Vapor pressure 0.81 Pa @ 25 °C