Synonyms: POLY(ISOPRENE), CIS, AVERAGE M.W. 800.000;POLYISOPRENE, CIS, AVERAGE MW CA. 40,000 (GPC) (MADE FROM SYNTHETIC RUBBER);POLYISOPRENE, CIS, AVERAGE MW CA. 38,000 (GPC) (MADE FROM NATURAL RUBBER);cis-Polyisopreneaveragemwca.38,000(gpc);madefromnaturalrubber;cis-Polyisoprene