2,2'- azobisisobutyronitrile (AIBN crystalline) is the best known azo initiators which are easy and safe to use in free radical polymerization catalyst in the processing temperature range of 45-90 °C, a primary criterion in controlling polymerisation reactions.

2,2'- azobisisobutyronitrile (AIBN crystalline) is usualy used in polymerisation reactions to reduce the residual monomer content or to initiate or terminate the polymerisation process. Also use for:

for the polymerization of monomers like vinyl chloride, vinyl acetate, ethylene, styrene, methyl methacrylate, etc.
as a chemical blowing agent for section rigid PVC foams when the processing temperature range is 100-120 °C
as a initiator in manufacture of nytron fibre
for initiating of process of chlorination of dichloroethane
in the manufacture of silicone rubber foam
in the manufacture of acrylic sheet, bangles, tubes, rods etc.