Insulating materials. Industrial rigid round laminated tubes & rods based on thermosetting resins for electrical purposes. Definitions, designations & general requirements Pipes, Bars (materials), Laminates, Circular shape, Reinforced materials, Industrial, Thermosetting polymers, Polymers, Plastics, Solid electrical insulating materials, Electrical insulating materials, Designations, Classification systems, Marking, Definitions, Silicones, Melamine resins, Epoxides, Epoxy resins, Phenolic resins