caulking materials, stuffing of rubber or plastic; shock-absorbing buffers of rubber for industrial machinery; electric, thermal and acoustic insulators; synthetic rubber; rubber, raw or semi-worked; threads of rubber, other than for textile use; liquid rubber; rubber solutions; rubber stoppers for industrial packaging containers; ebonite; rubber sleeves for protecting parts of machines; washers of rubber or vulcanized fiber; non-metal gaskets for sealing metal pipes and plastic pipes; joint ...