Na halitta roba fili ne na halitta polymer fili tare da polyisoprene a matsayin babban bangaren.Tsarin kwayoyin halittarsa shine (C5H8) n.Kashi 91% zuwa 94% na abubuwan da ke cikinsa sune roba hydrocarbons (polyisoprene), sauran kuma sunadaran gina jiki, abubuwan da ba na roba ba kamar fatty acid, ash, sugars, da dai sauransu.
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