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Azobisisobutyronitrile

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    Specialty Chemicals

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Product Profile

2,2′-Azobis(2-methylpropionitrile) (AIBN)

CAS No.: 78-67-1
Synonyms / IUPAC Name: 2,2′-Azobis(2-methylpropionitrile), AIBN
Molecular Formula: C₈H₁₂N₄
Molecular Weight: 164.21 g/mol


Physicochemical Properties (Typical)

  • Appearance: White crystalline powder
  • Odor: Essentially odorless
  • Melting Point: 102–104 °C (decomposition begins)
  • Boiling Point: Decomposes before boiling
  • Density: ~ 1.11 g/cm³
  • Solubility: Insoluble in water; soluble in common organic solvents (alcohols, ethers, acetone, etc.)
  • Stability: Stable under cool, dry, dark conditions; decomposes on heating, friction, or shock
  • Decomposition Behavior: At ~ 65–70 °C, decomposes to release nitrogen and generate free radicals

Purity & Quality Standards

  • Purity (by GC / other): ≥ 98.0%
  • Moisture / Water Content: ≤ 0.5%
  • Residual Solvents / Impurities: Strictly controlled
  • Heavy Metals: ≤ 0.001%
  • Analytical Methods: Gas chromatography, spectroscopy
  • Documentation: Certificate of Analysis (COA) and Safety Data Sheet (SDS) available

Applications / Uses

  • Radical initiator for polymerization (vinyl monomers, acrylates, etc.)
  • Blowing agent in plastics and rubber foam processes
  • Initiator in chemical synthesis and crosslinking reactions
  • Utility in radical-mediated reactions (grafting, curing)

Safety & Handling

  • Hazard Classification: Self-reactive substance; may cause fire or explosion on heating
  • Health Hazards: Harmful by inhalation or swallowing; may cause organ damage with prolonged exposure
  • Fire / Explosion Risks: Dust may form explosive mixtures with air; decomposition is exothermic
  • Handling Precautions:
    • Use in well-ventilated areas
    • Avoid heat, sparks, friction, impact
    • Wear gloves, goggles, protective clothing
    • Use explosion-proof equipment
  • Incompatibilities: Strong oxidizers, acids, bases, metal salts
  • First Aid:
    • Inhalation – Move to fresh air
    • Skin – Wash with water
    • Eyes – Rinse thoroughly with water
    • Ingestion – Seek medical attention

Packaging & Storage

  • Packaging: Sealed, inert containers (e.g. metal or lined containers)
  • Storage Conditions: Cool, dry, dark, and well-ventilated area, away from heat sources
  • Container Closure: Keep tightly closed; protect from light and moisture
  • Storage Temperature: Generally recommended below 10 °C
  • Shelf Life: 12–24 months under proper storage