The deal is about HyJet (Exxon), and analogs (Valvoline Ultramax and Solutia/Eastman Skydrol).
Aviation hydraulic fluids based on fire resistant alkyl and/or aryl phenyl phosphate esters may contain PFAS additives such as cyclohexanesulfonic acid, decafluoro(pentafluoroethyl), potassium salt (CAS No. 67584-42-3) and different chain-length homologs in concentrations of about 0.05% . Other possible substances are cyclohexanesulfonic acid, decafluoro(trifluoromethyl)-, Potassium salt, CAS No 68156-07-0, cylohexanesulfonic acid, nonafluorobis(trifluoromethyl)-, Potassium salt, CAS No. 68156-01-4 or cyclohexanesulfonic acid, undecafluoro-, Potassium salt, CAS No.3107-18-4
These additives are extremely effective and thermally and electrochemically stable, but PFAS are now banned.
I have no specific and direct experience in this sector. But technically reasoning may suggest that since PFAS are banned the problem should be solved (if not already solved and present in tech-literature) experimentally, by specific research.
As already well known:
1. Zeta potential is shown by any particle in suspension, macromolecule or material surface.
2. Zeta potential can be measured by electrophoresis .
3. Electrophoresis measures can be used to optimize the formulations of suspensions, emulsions and predict interactions with surfaces, and optimise the formation of films and coatings.
4. As the salt content of the solution is increased, the electrical double layer is compressed and the Zeta potential should decrease.
5. Different kind salt can be experimented in different solutions in a lab configuration under mesurament, keeping also in mind the possibility to decrease the negative potential of the solution by means of counterbalancing with a minimum positive potential indotto (where possible!).
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