Quote:
Originally Posted by red-beard
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Which is problematic, as viton and buna N (nitril) are the most common elastomeric materials used on machinery and are very good with motor oil. Viton is great with gasoline but bad for alcohol. Buna n is Ok with gas and good with oil but bad with ethanol.
EPDM is very good for alcohol but terrible for gasoline and most oils. Swells up and turns to gum.
The last material listed on that chart is Kalrez. Expensive stuff but awesome.
At my last job I spent a quarter mil a year at least on kalrez O-rings. It has nearly the chemical resistance of PTFE and nearly physical properties of a neoprene (but usually a little harder and a little less memory).
It's the go-to when working with strong volatile aromatics.