| 摘要 |
The present invention relates to permeable closed cell foam. The foam may be produced by forming a substrate including a polymeric material, a foaming agent and optionally a crosslinking agent. Holes may be formed in the substrate and the substrate may be crosslinked. The foaming agent may then be activated to expand the foam. The closed cells may be present at a level of greater than about 50% in a given portion of any foam.
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