| http://www.w3.org/ns/prov#value | - materials capable of reducing the friction include polyolefins such as polyethylene, polypropylene, etc., polyvinyl chloride, polyesters (PET, PBT, etc.), polyamides, polyimides, polyurethane, polystyrene, polycarbonate, siliconeresins, fluororesins (PTFE, ETFE, etc.), and composite materials of these.The resin coating layer 8 may also be formed for the purpose of enhancing safety in inserting the
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