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