Insulating materials. Industrial rigid round laminated tubes & rods based on thermosetting resins for electrical purposes. Specifications for individual materials. Round laminated rolled tubes Laminates, Pipes, Thermosetting polymers, Plastics, Polymers, Industrial, Reinforced materials, Circular shape, Rolling, Diameter, Thickness, Dimensional tolerances, Straightness measurement, Dielectric strength, Water absorption, Cohesion, Permittivity, Electrical insulation, Electrical resistance, Compressive strength, Rigid pipes, Designations, Breakdown voltage, Dissipation factor, Thermal resistance, Density, Flexural strength