Abstract: A thermosetting highly foaming sealer of this invention contains an unvulcanized rubber, a vulcanizing agent, a softener and an inorganic filler. It is bonded on one of two parallel planes forming a gap, and is vulcanized and foamed by heating to fill up the gap. A feature of the thermosetting highly foaming sealer is that it comprises a first sealing member bonded on one of two parallel planes before heating, foaming and expanding from 1 to 2 times of original volume thereof when vulcanized by heating, and a second sealing member laminated on the first sealing member foaming and expanding 6 times or more of original volume thereof when vulcanized by heating. Accordingly, the thermosetting highly foaming sealer of this invention can securely fill the gap without running down or slipping off even when it is provided on a vertical plane, thereby preventing dusts and water from intruding from environment. The thermosetting highly foaming sealer thus shows a good rustproofing capability as well.

Abstract: A thermosetting foaming sealer of this invention is a thermosetting foaming sealer for filling up a vacant space. The thermosetting foaming sealer comprises a foaming substance having a shape substantially agreeing with a vacant space to be filled up, and a restraining substance for restraining the foaming substance in a compressed state, wherein the restraining substance is an elastomer having high viscosity at room temperature, substantially maintaining the compressed state of the compressed foaming substance, and coming to have low viscosity during paint film baking. The thermosetting foaming sealer can be provided firmly at a predetermined position and can fill up the vacant space at the predetermined position. Thus, desired silence, for instance, in an automobile has been attained by employing the thermosetting foaming sealer.