Raba wachilengedwe ndi polima wachilengedwe wokhala ndi polyisoprene monga gawo lalikulu.Mapangidwe ake a molekyulu ndi (C5H8)n.91% mpaka 94% ya zigawo zake ndi rabara hydrocarbons (polyisoprene), ndipo ena onse ndi mapuloteni, Non-raba zinthu monga mafuta zidulo, phulusa, shuga, etc. Natural labala ndi...
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