1964, Coran et vanhu maererano nekubuda kweiyo vulcanizate, mercapto-thigule (MBT) yeZinc Molecule. akaumbwa anenge anoshaya anenge atenda .}}}
Muna 1969, Manik nevamwe vanhu vanobva pane sumo yeAcids neThiazo Accelism Steatate {{4], neRabha Hydrocarbon r kuti ubudise mstsxr haina kugadzikana, iyo}}}}}}}}}}}}}}}}}}}