Plastics. Plasticized poly (vinyl chloride) (PVC-P) membranes for inground swimming pools. Homogenous membranes of nominal thickness equal to or greater than 0, 75 mm Plastics, Polyvinyl chloride, Plasticized polyvinyl chloride, Swimming pools, Membranes, Thickness, Homogeneity, Appearance, Physical properties of materials, Dimensional tolerances, Mechanical properties of materials, Durability, Sheet materials