Laminates, Bars (materials), Pipes, Thermosetting polymers, Plastics, Polymers, Industrial, Solid electrical insulating materials, Electrical insulating materials, Reinforced materials, Circular shape, Rigid pipes, Dimensional measurement, Mechanical testing, Bend testing, Compression testing, Electrical testing, Specimen preparation, Test specimens, Testing conditions, Endurance testing, Thermal testing, Water-absorption tests, Density measurement, Flammability