Flexible cellular polymeric materials. Sponge and expanded cellular rubber products. Specification. Sheeting|Quality, Inspection, Water-absorption tests, Natural rubber, Compression set, Grades (quality), Test specimens, Dimensions, Classification systems, Marking, Acceptance inspection, Cellular materials, Thermal resistance, Moisture control, Chemical-resistance tests, Test equipment, Testing conditions, Polymers, Ozone, Plastics and rubber technology, Synthetic rubber, Sheet materials