Gasket and the manufacturing method thereof

A gasket, being interposed between flanges which are connecting portions of pipes, the gasket comprising:

• a kammprofile having an inner side end portion and an outer side end portion;
• an O-ring member provided at an inner side of the inner side end portion;
• a first jacket encasing the kammprofile and the O-ring member from a lower side of the kammprofile, wherein one end portion of the first jacket is bent up around the O-ring member and the other end portion of the first jacket is bent up around the outer end portion of the kammprofile;
• a second jacket encasing the kammprofile and the O-ring member from an upper side of the kammprofile, wherein one end portion of the second jacket is bent down around the O-ring member to be overlapped with the first jacket, and the other end portion of the second jacket is bent down around the outer end portion of the kammprofile to be overlapped with the first jacket;
• a first sealing layer formed on an upper surface and a lower surface of the kammprofile, respectively;
• a second sealing layer formed to cover an upper side of the second jacket;
• and
• a third sealing layer formed to cover both a lower side of the first jacket and a portion of the second jacket overlapped with the lower side of the first jacket,
• wherein the inner side end portion has a concave curvature towards the O-ring member, and the outer side end portion has a convex curvature towards the first jacket.