<Tr> <Td> Sapotaceae <P> Chicle </P> <P> Chiquibul </P> <P> Crown Gum </P> <P> Gutta hang kang </P> <P> Massaranduba balata </P> <P> Massaranduba chocolate </P> <P> Nispero </P> <P> Rosidinha </P> <P> Venezuelan chicle </P> </Td> <Td> Butadiene - styrene rubber <P> Isobutylene - isoprene copolymer (butyl rubber) </P> <P> Paraffin (via the Fischer - Tropsch process) </P> <P> Petroleum wax </P> <P> Petroleum wax synthetic </P> <P> Polyethylene </P> <P> Polyisobutylene Polyvinyl acetate </P> </Td> </Tr> <P> Gutta hang kang </P> <P> Isobutylene - isoprene copolymer (butyl rubber) </P> <P> Paraffin (via the Fischer - Tropsch process) </P>

When was the first time chewing gum was used by humans