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Porpous PTFE film and a manufacturing method therefor

  • US 5,476,589 A
  • Filed: 03/10/1995
  • Issued: 12/19/1995
  • Est. Priority Date: 03/10/1995
  • Status: Expired due to Term
First Claim
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1. A thin porous polytetrafluoroethylene membrane consisting essentially of a nonwoven web having a microstructure of substantially only microfibrils fused at crossover points, said membrane having:

  • (a) a pore size between 0.05 and 0.4 micrometers;

    (b) a bubble point between 10 and 60 psi;

    (c) a pore size distribution value between 1.05 and 1.20;

    (d) a ball burst strength between 0.9 and 17 lbs./Force;

    (e) an air flow of between 20 Frazier number and 10 Gurley seconds;

    (f) a thickness between 1-25.4 micrometers.

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