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Polymeric foam gaskets and seals

  • US 6,646,199 B2
  • Filed: 04/26/2001
  • Issued: 11/11/2003
  • Est. Priority Date: 10/20/1999
  • Status: Expired due to Fees
First Claim
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1. A gasket or seal comprising an electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:

  • 1, wherein the foam a density of at most about 3 g/cm3, wherein the foam has a noise shielding effectiveness at about 20 to about 1000 MHz of at least about 10 dB and a compression deflection value at 50% compression of at most about 25 psi, and wherein the conductive filler concentration is about 140 phr to about 900 phr.

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