The invention relates to a sealing disc for a container closure used for a container having a mouth delimited by a circumferential edge. The sealing disc is composed of a plurality of layers with an edge. Before the container is opened for the first time, at least one group of layers tightly closes the mouth of said container. One of the layers is a metallic layer that can be heated by induction. The other layers are non-metallic and unable to be directly heated by induction. The group of layers can be sealed, using a sealing layer, on the circumferential edge of the mouth. One of the layers is composed of a thermally insulating material. The sealing disc has at least one grip tab. The grip tab is formed from just one or more of the layers of the layer group. The surfaces of the layers that form said grip tab project beyond the edge of the metallic, induction-heatable layer of the group for the length of the surface of the grip tab. Said grip tab is formed only from the layer composed of thermally insulating material, or from said layer and one or more of the other non-metallic layers that are unable to be directly heated by induction. The grip tab is doubled over on the uppermost layer of the sealing disc.