Sealing member for gasket, and gasket comprising same

An insulating gasket comprising:

• a central layer;
• and
• a first layer and a second layer respectively provided on an upper surface and a lower surface of the central layer,
• wherein the first layer includes a first groove, the second layer includes a second groove, and a sealing device is disposed in each of the first groove and the second groove,
• wherein the sealing device which is in the form of a stripe and comprises a C-ring portion at an inner end thereof, the C-ring portion being open in an inner direction,
• wherein the C-ring portion is formed of a resilient material and be capable to be stretched out or contracted,
• wherein the sealing device includes an outer lower end having a first outwardly cut portion which is cut in the inner direction, and
• wherein inner sidewalls of each of the first and second grooves and an inner end of the sealing device are spaced a certain distance from each other in order to be physically insulated from each other.