One, the composition is different

1. Epoxy resin: the polycondensation product of epichlorohydrin and bisphenol A or polyol.

2. Polyester: a general term for polymers obtained by polycondensation of polyols and polyacids. Mainly refers to polyethylene terephthalate (PET), and customarily also includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polyarylate.

2. Different application fields

1. Epoxy resin: Epoxy resin is mainly used in the coating industry and the electronics industry. Epoxy for composite molding (mainly used in printed circuit boards in the electronics industry) accounts for a quarter.