| http://www.w3.org/ns/prov#value | - For the composite resin material which constitutes the coating layer 51b, for example, a polymer material such as silicone rubber, fluorocarbon rubber, etc., fluorocarbon resin such as PFA, PTEF (polytetrafluoroethylene), etc., or a mixture of these fluorocarbon resin and fluorocarbon rubber may be suitably adopted.
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