High Epoxy Equivalent Hydrogenated Bisphenol A Epoxy Resin HWR-5100 Used As Paint For Outdoors HWR-5100 Hydrogenated Bisphenol A Epoxy Resin 1. Description: HWR-5100 Hydrogenated bisphenol A epoxy resin has the characteristics of low viscosity, high transparency and long-term non-discoloration. The cured product has good ultraviolet resistance, long-term aging resistance and no discoloration. The cured product has very good transparency, and relatively high heat resistance,