... thermosetting epoxy resin, using the filement winding technique. GRE pipes and fittings are made from glass reinforcement and thermosetting epoxy resin, ... international standards such as ASTM, API, ISO, UKOOA. GRE pipes and fittings diameter range starts from 1.5" up to 10". ... of the connection of the specific sealing compound 5.Specialized fittings Flange, elbow, tee, coupling, male-thread of on-the ...