Insulator core rod made of ECR fiberglass reinforced the epoxy resin.Insulator core rods also are also called fiberglass rod,FRP rod,GRP rod,fiberglass bar,Insulation rod,fiberglass stick ,ECR rod and so on. 1.Standard: IEC61109 2.Material: E glass and epoxy resin. 3.Process: Continuous pultrusion. For more detail,