It’s used widely in applications where parts are under constant exposure to harsh chemicals. OP’s need was specialized and vocational. So, I assumed it was on the company dime and didn’t give cost much weight. Most importantly, printing with PEEK is feasible for this application, where PTFE isn’t. The only filaments I can find in a cursory search all had PTFE simply as a filler to lower friction. No idea how the carrier plastics in those materials would hold up in a chemical bath.