High temperature, high pressure chemical resistant seal material

Details High temperature, high pressure chemical resistant seal material High temperature, high pressure chemical resistant seal material

1981-05-14

1983-02-15

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 46, H01M 208

Patent

active

043741851

ABSTRACT:
A seal material especially adapted for phosphoric acid fuel cell stack sealing is described comprising an unfilled, unoiled high molecular weight polytetrafluoroethylene. Although the seal material is especially adapted as the regular seal around the plenums separating the oxygen and hydrogen gas inlets and outlets, it can also be used as a plenum or stack crack sealer. The material provides seal integrity and stability at temperatures in excess of 400.degree. F. (204.degree. C.)., e.g. 400.degree. F. to 450.degree. F. (204.degree. C. to 232.degree. C.), in a corrosive chemical environment at differential pressures above 50 psi (e.g. 50 psi to 80 psi). It can be used in electrochemical cells in general where high temperature, high pressure, corrosive environments prevail.

REFERENCES:
patent: 3979224 (1976-09-01), Strasser
patent: 4259389 (1981-03-01), Vine et al.
patent: 4269642 (1981-05-01), De Casperis et al.

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