Azobisisobutyronitrile
CAS Number
78-67-1
EC Number
201-132-3
Abbreviation
AIBN
What is Azobisisobutyronitrile?
Azobisisobutyronitrile (CAS 78-67-1), commonly known as AIBN, is a free-radical initiator used to drive polymerization reactions.
Where is Azobisisobutyronitrile used?
- Plastics and polymer manufacturing: initiates PVC, polystyrene, polyacrylates and other vinyl-based polymers
- Coatings: cures acrylic and styrenic resin systems, influencing film hardness, adhesion and cross-link density
- Adhesives and sealants: supports synthesis of pressure-sensitive and structural adhesive polymers
- Printing and packaging: AIBN-initiated resins for UV-stable inks and barrier coatings on flexible substrates
- It decomposes at moderate temperatures to generate nitrogen gas and carbon-centered radicals, triggering chain growth in bulk and solution polymerization.
Commercial specifications
- Purity typically 98% or higher
- Packaging from small quantities to bulk volumes
- Temperature-controlled handling required throughout the supply chain
Other Names (Synonyms)
AIBN|2,2'-Azobis(2-methylpropionitrile)|Azdh|Porofor N|Aceto AZIB|Pianofor an|Porofor 57|Chkhz 57
What are the physical properties of Azobisisobutyronitrile?
Melting Point 105 °C
Boiling Point >260 °C
Density 0.68 g/cm³ (soild)
Flash Point 4°C
Appearance Azobisisobutylonitrile is a white crystalline compound.
Color Crystals from EtOH
Odor odorless
Form Solid
Water Solubility Insoluble
Vapor Pressure 0.81Pa at 24.85℃
Refractive Index n20/D1.495
Log P 1.1 at 25℃
How is Azobisisobutyronitrile classified and handled safely? Learn More
Danger
GHS02· Flammable GHS07· Irritant GHS06· Toxic GHS08· Health Hazard
Hazard Statements
H242 Heating may cause a fire
H301 Toxic if swallowed
H302 Harmful if swallowed
H332 Harmful if inhaled
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P234 Keep only in original packaging.
P235 Keep cool.
Which trade and regulatory codes apply to Azobisisobutyronitrile?
HS Code 29269090
UN Number 3234
ADR Class 4.1
Storage Class 3 - Flammable liquids
WGK (Germany) 2