Tracked Changes. Plastics. Unplasticized poly(vinyl chloride) sheets. Types, dimensions and characteristics for sheets of thickness not less than 1 mm|Optical properties of materials, Test equipment, Dimensional tolerances, Thickness, Dimensional changes, Plastics, Test specimens, Sheet materials, Dimensions, Luminescence, Thermal properties of materials, Marking, Surface texture, Bend testing, Specimen preparation, Designations, Impact testing, Mechanical properties of materials, Unplasticized polyvinyl chloride, Polyvinyl chloride, Classification systems, Softening point, Thermal testing, Rectangular shape