| 摘要 |
A heat expandable baffle having a shape corresponding to, but smaller than, the shape of the cross section of a cavity to be sealed, and comprising a rigid support plate, a carrier for a heat expandable material and a heat expandable material mounted only to the outer periphery of the carrier. When activated by heating, the expandable material expand radially from the carrier to seal the cross sectional gap between the carrier and the cavity wall.
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