Polymer-related chemicals


CAS : 20858-12-2

non-nitrile non-halogen water soluble

Plastics manufacturing


VA-061 is the free base of VA-044 and VA-046B, which are water-soluble azo polymerization initiators. By forming salts with different organic acids, the product dissolves in water, creating a highly effective initiator for polymerization of water-soluble vinyl monomers.

  • Non-nitrile azo initiator
  • Soluble in acidic aqueous solution, potential for aqueous polymerization of non-halogen using organic acid like acetic acid.
  • 10 Hour half-life decomposition temperature: 61℃(at about 45℃ in acidic aqueous solution)
Structural formula of 2,2'-Azobis[2-(2-imidazolin-2-yl)propane]
Chemical name 2,2'-Azobis[2-(2-imidazolin-2-yl)propane]
CAS RN® 20858-12-2
Molecular weight 250.35
Molecular formula C12H22N6

Physical characteristics

pale yellow
crystalline powder
Melting point/freezing point 115-125(dec.) °C
10hour half-life decomposition temperature 61℃(in methanol)
Activation energy 113.9 kJ/mol
Frequency factor (ln A) 30.16

water : practically insoluble.
methanol : soluble.
ethanol, chloroform : slightly soluble.
toluene : insoluble .

SADT 50℃

*SADT: Self-accelerating decomposition temperature

Packaging & Storage conditions

Packaging 5kg / 500g
Storage conditions keep under 10℃

Related laws and regulations

TSCA Listed
REACH Not Listed

Here, you can calculate the ‘residue rate’, ‘decomposition reaction time’, and ‘temperature during the decomposition reaction’ of azo polymerization initiators.

Image of Azo Residue Rate Calculation Tool