A vehicle seat suspension has a thin high strength elastomeric membrane. The membrane is formed from block copolymer material by a process in which a sheet is extruded and tensioned to orient molecules in a select direction with respect to the membrane; the oriented membrane is annealed to retain the...http://www.google.fr/patents/US5009827?utm_source=gb-gplus-shareBrevet US5009827 - Process for forming an elastomeric membrane
