SHOCK-ABSORBING BUFFERS OF RUBBER; GASKETS; JUNCTION FOR PIPES, NOT OF METAL; PLASTIC FIBERS, NOT FOR TEXTILE USE; PLASTIC SUBSTANCES, SEMI-PROCESSED; ARTIFICIAL RESINS; SYNTHETIC RESINS; RUBBER STOPPERS; SHOCK ABSORBING BUFFERS OF RUBBER; STOPS OF RUBBER; SYNTHETIC RUBBER; WATERPROOF PACKINGS; WEATHER STRIPPING COMPOSITIONS