What‘s ECR rods? fiberglass epoxy core manufacturer China

https://www.artisanmake.com/fiberglass-frp-ecr-rods-winding-tubes-supplier

ECR rods also called FRP Epoxy rods，it Pultruded sections such as FRP Rods, FRP Tubes/Pipes, Dog Bone, Corner Angle, Hat section, Threaded Rods, Studs, FRP Strips/Flats, FRP Nuts and FRP Angles etc. 
Epoxy resins are impregnating compounds with the highest available quality of all comparable polymers for the pultrusions of FRP rod materials. Hot curing epoxy resin in combination with anhydride hardener gives an aging/hydrolysis resistant high strength matrix component. Polyester resins are not hydrolysis resistant and have lower mechanical and electrical properties.

where to use ECR rods？
such as composite insulators，surge arresters，power equipment，The transformer tank