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