Currently, most of the composites in the world are thermosetting during which the Unsaturated Polyester (UP) will have severe shrinkage and distortion. Polyvinyl Acetate (PVAC) known as ultra anti shrinkage additive is specially against the critical shrinkage (6-10%) occurred in casting the liquid of Styrene and hot UP in making SMC/BMC for the industries of Auto Parts, FRP Products, Electronics, Doors and Windows etc, and can reduce the shrinking rate down to 0.05% and lower.
Polyvinyl Acetate (PVAC) whose content is Polyvinyl Acetate (PVAc) with a Molecular Formula（C4H6O2）n. is classified into following grades:
With a wide range of experiments and the pragmatic utilization of our customers in GRP (FRP) industry, Polyvinyl Acetate (PVAC) is proved to have outstanding performance in Anti-Shrinkage, Flow Mark and Gloss Enhancement for the auto headlamp reflectors during casting. If added into Car Bumpers, Polyvinyl Acetate PVAC can improve the bumpers with lower shrinkage, higher impact resistance and less brittleness. Particularly in GRP (FRP) Sheets processing, Polyvinyl Acetate PVAC has already been of significant effect.