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AC system seals

What material needs to be used for the O-rings saels on an old York 
compressor? The chemical resistance charts I have show that VITON, BUNA N, 
and EPDM  are all attacked by Freon 12. Teflon shows good to 130 degrees F. 
What is the recommended material? Any BTDT? What would be compatable with 
R134?

I'm ready to re-install the AC on the URQ, and need to replace the O-rings 
for some hose connections.

Dennis Graber