| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cup seal having high strength and superior durability while maintaining sealing property. <P>SOLUTION: The cup seal comprises at least two layers of a rubber member 11 formed as the inner peripheral face of a cylinder body and as a seal face for contacting a piston and a core material 12 provided on the face of the rubber member 11 different from the seal face and formed of a material different from that of the rubber member 11. <P>COPYRIGHT: (C)2008,JPO&INPIT |
