V-65B is an oil-soluble azo initiator having a low decomposition temperature. It is freely soluble in various organic solvents and has a 10 hour half-life decomposition temperature of 51° C.

It can be applied for various polymerizations.

Chemical Name


CAS No.: 4419-11-8
Molecular weight: 248.37

Physical characteristics

Appearance White crystalline powder
Melting/freezing point 45-70° C
10 hour half-time decomposition temperature 51° C in toluene
Activation energy 117.8 KJ/mol K
Frequency factor (ln A) 32.94
Solubility Soluble in benzene, acetone, ether, DMF, toluene and methanol
Insoluble in water
Self-accelerating decomposition temperature (SADT) 30° C


Main Applications

  • Acrylic resins for paints and coatings
  • PMMA and PVC
  • Casted plates, resists and flocculants


  • EINECS No.: 224-583-8
  • REACH: n/a


Store under 15°C in a well-ventilated position. Protect from heat and direct sunlight. Do not seal container gastight. Store only in the original container.

Safety information

Health Hazard

For specific information on the safe handling of the product, please refer to the material safety data sheet (MSDS) which is available on request.