Ключевые слова:
Plastics, Marking, Luminescence, Dimensions, Designations, Optical properties of materials, Dimensional tolerances, Test specimens, Specimen preparation, Thermal testing, Polyvinyl chloride, Softening point, Surface texture, Classification systems, Thermal properties of materials, Thickness, Dimensional changes, Impact testing, Mechanical properties of materials, Unplasticized polyvinyl chloride, Bend testing, Test equipment, Rectangular shape, Sheet materials