Description:

CPA stands for Colorless Polyester Accelerator. The CPA Grade, is used in the curing of polyester and vinyl ester resins with methyl ethyl ketone peroxide (MEKP) type catalysts. Promoters are also called accelerators. They can be added to the resin by the supplier, in which case the resin is said to be pre-promoted.

Alternatively, the manufacturer prior to adding catalyst to the resin can add promoters. The purpose of cobalt-based promoters is to speed up the curing reaction of polyester and vinyl ester resins and allow them to cure at room temperature. The cobalt-based promoter helps the catalyst to start the chemical reaction between the resin and styrene monomer and form a cured solid.