Ключевые слова:
Sealing rings, Seals, Toroidal sealing rings, Elastomers, Natural rubber, Synthetic rubber, Pipe couplings, Pipes, Pipelines, Drainage, Sewers, Rainwater pipes, Drainpipes, Water supply and waste systems (buildings), Potable water, Polyurethane, Casting (process), Sealing materials, Polymers, Hardness, Tensile strength, Elongation at fracture, Compression set, Ageing (materials), Stress relaxation