TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Material: The rubber material is natural rubber (NR), polyisoprene rubber (IR), butadiene rubber (BR), chloroprene rubber (CR), rubber-like copolymer of isobutene and isoprene (IIR), preferably isobutylene-isoprene rubber, rubber-like copolymer of styrene and butadiene (SBR), rubber-like copolymer of ethylene and propylene (EPM), rubber-like copolymer of ethylene, propylene and diene (EPDM), rubber-like copolymer of acrylonitrile and butadiene (NBR), preferably nitrile rubber, chlorosulfonated polyethylene (CSM), acrylic rubber, polychloro methyl oxirane (CO), rubber-like copolymer of ethylene oxide and epichlorohydrin (ECO), rubber-like copolymer having fluoro and perfluoro alkyl, or perfluoroalkoxy group in side chain (FKM), rubber-like copolymer tetrafluoroethylene and propylene (FEPM), silicone rubber having methyl-substitution group and vinyl substituent in polymer chain (VMQ), silicone rubber having methyl-substitution group, vinyl and fluoro substituent in polymer chain (FVMQ), polyether urethane (EU), polyester urethane (AU), rubber-like copolymer of ethyl acrylate or another acrylic ester, and ethylene (AEM), rubber-like copolymer of ethyl acrylate or another acrylic ester, and acrylonitrile (ANM), rubber-like copolymer of hydrogenated acrylonitrile and butadiene (HNBR), rubber-like copolymer of carboxylated acrylonitrile and butadiene (XNBR), norbornene rubber (NOR), rubber-like copolymer of acrylonitrile, butadiene and isoprene (NBIR), rubber-like copolymer of brominated isobutene and isoprene (BIIR), preferably brominated butyl rubber, rubber-like copolymer of chlorinated isobutene and isoprene (CIIR), preferably chlorinated butyl rubber, rubber-like copolymer of epichlorohydrin and aryl glycidyl ether (GCO), rubber-like copolymer of ethylene oxide, epichlorohydrin and arylglycidyl ether (GECO), silicone rubber having methyl-substitution group in a polymer chain, preferably poly-dimethyl siloxane (MQ), silicone rubber having methyl-substitution group and phenyl substituent in a polymer chain (PMQ) and/or silicone rubber having methyl-substitution group vinyl substituent and a phenyl substituent in a polymer chain (PVMQ).