Pump diaphragm and method for making the same
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United States of America Patent
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Oct 31, 2000
Grant Date -
N/A
app pub date -
Sep 23, 1998
filing date -
Sep 23, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composite pump diaphragm 10 includes a layer 12 fabricated from annealed polytetrafluoroethylene (PTFE) bonded to a layer 14 fabricated from an unreinforced thermoplastic elastomer including ethylene-propylene terpolymer (EPDM) and polypropylene. The diaphragm 10 is fabricated by chemically etching the PTFE layer 12, coating a surface thereof with a polyurethane adhesive, superimposing the layer 14 with layer 12 under heat and pressure, and allowing the superimposed layers to cure.
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