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However, it's performance in acids is very dependent on the type of acid - PEEK shows poor resistance in oleum and concentrated sulphiric, nitric, hydrochloric, hydrobromic and other mineral acids. It's resistance to hydrofluoric acid is very poor. PEEK shows good resistance to phosphoric acid and organic acids (acetic, citric, oxalic, tataric etc.), but varying resistance in the presence of halogens. PEEK is resistant to dissolution by some formaldehydes and ketones such as acetone, but not (at higher temperature) methylethyl ketone.
PEEK is also considered an advanced biomaterial used in medical implants (often in reinforced format using biocompatable fibre fillers such as carbon).
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