摘要 |
<p>A capsule (10) is formed from a pre-expanded foam core (12) in a compressed condition with a thermoplastic outer covering (14) completely enveloping the foam core (12) to maintain it in the compressed condition. The outer covering (14) is made of a material capable of softening sufficiently when heated to permit the foam core (12) to expand toward its original expanded uncompressed condition. Preferably, the outer covering (14) adheres to the foam (12) and then is carried by the expanding foam (12) into intimate contact with the inner surface of a hollow structural member so as to form a seal for the hollow structural member.</p> |