V-70 is an oil-soluble azo initiator having a low decomposition temperature. It is soluble in various organic solvents and has a 10 hour half-life decomposition temperature of 30° C.

It has the highest polymerization activity of Wako’s azo initiators and can be used as an alternative to photo reaction as radical generator.

Chemical Name


CAS No.: 15545-97-8
Molecular weight: 308.43

Physical characteristics

Appearance Nearly white crystalline powder
Melting/freezing point 50-96° C
10 hour half-time decomposition temperature 30° C in toluene
Activation energy 94.3 KJ/mol K
Frequency factor (ln A) 27.01
Solubility Freely soluble in dichloromethane
Soluble in acetonitrile and DMF
Slightly soluble in methanol, acetone and toluene
Practically insoluble in water
Self-accelerating decomposition temperature (SADT) 30° C


Main Applications

  • Ethylene Vinyl Alcohol copolymers (EVOH)


  • EINECS No.: 239-593-8
  • REACH: n/a


Store under -10°C in dry conditions in a well-ventilated location. Protect from heat and direct sunlight. Do not seal container gastight.

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.