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Natural Rubber LatexChemically, natural rubber, sap from the rubber tree, is the unsaturated hydrocarbon,polyisoprene; (C 5 H 8 ) n . The cis isomer makes up about 99.9% of the rubber solids innatural rubber latex.This has the structure:-CH 3 H- (CH 2 C=CCH 2 ) n – where n = 3000-5000 and the molecular weight 200,000 –350,000.Natural rubber is listed under two EU PM numbers 24250 and 84560 and CASnumber 009006-04-6.43Europäische Vereinigung der Lack-, Druckfarben- und KünstlerfarbenindustrieEuropean Council of Paint, Printing Inks and Artists' Colours IndustryAvenue E. Van Nieuwenhuyse 4 - BE-1160 BrusselsTel:+32 (0)2 676 7480 - Fax: + 32 (0)2 676 7490 - E-mail: secretariat@cepe.org -Internet: http://www.cepe.org/