No polymer-based fabric will go as high as Gore-Tex, which is
essentially not-quite-Teflon. 550F happens to be the sintering
temperature of Teflon. Polyimides might get somewhere close (still
lower). What is the application? Glass fiber will go much higher - it
is available woven and non-woven. Usually used for insulation, I've
used it up to 500-600C.
The special thing about Gore-Tex is both it being fluorinated (low
wetting) combined with the porosity. Tiny capillary spaces + low
surface energy = very difficult to get a drop of water through.
However the high porosity also makes it 'breathable' because gases can
pass surface tensionlessly through the pores. If these properties are
what you are looking for, you won't find anything higher temp, sorry.
You might check out some of the inoganic polymers to see if they have what
you need. I think Dow had something a while back. By using boron, silicon,
phosphorous, etc, there are some polymers that have been made which might
have the temperature range you need. Carbon fiber might also do something
for you, though I doubt that you can get the great properties of Gore Tex.
What properties are you looking for? flexibilty, insulation, breathabilty,
I think this is precisely how the discussion should have started.
Materials science is mostly about combinations of material properties.
The original poster does not explain why limit the search only to
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