Patent ID: 8469143

Claim:
An insert for sealing and acoustic damping of a longitudinal cavity having an interior surface, comprising a) one or more carrier plates made of a polymeric material (A) which does not deform when heated to a temperature not higher than 180° C., comprising a peripheral section and a central section, and b) a thermally expandable material (B), wherein the polymeric material (A) comprises a main polymer (A1) which gives mechanical strength to the carrier plate and comprises: polyester, polypropylene, polyurethanes, polyamides, polyphenylene sulphides, polyphenylene ethers, polyphenylene sulfones, polyether imides and/or polyphenylene imides, and at least one vibration-damping polymer (A2) which comprises: thermoplastic polyurethanes, styrene/butadiene block copolymers, hydrogenated styrene/butadiene block copolymers, styrene/isoprene block copolymers, hydrogenated styrene/isoprene block copolymers, styrene/isoprene/styrene tri-block copolymers, and/or hydrogenated styrene/isoprene/styrene tri-block copolymers.