Resources
Chemical compatibility
A screening chart for FFKM as a polymer class, organised by media family — including the cases where it is not suitable.
Ratings describe the behaviour of the FFKM polymer class in the named medium. They are a screening aid, not a design approval. Note the documented exceptions: fuming nitric acid, fluorine (F₂), chlorine trifluoride (ClF₃) and high-pressure wet oxygen will attack FFKM. Concentration, temperature, immersion duration, pressure and mechanical stress all change the result. For any medium not listed here, send us the concentration, temperature and duration and we will return a written assessment.
Organic acids 4
FFKM's principal strength. Resistance is broad across this family.
Inorganic acids 6
Hydrochloric and phosphoric are fine. Hot fuming oxidising acids are the documented exception.
Solvents 8
This is where FFKM decisively outperforms FKM, which is limited in ketones, esters and amines.
Amines & amines / amine salts 4
A common failure point for FKM. FFKM retains compatibility, but wet-process duties should be reviewed for amine additives.
Petroleum & hydrocarbons 5
Oxidisers & special gases 8
Two genuine exceptions live here. Confirm with engineering before specifying.
Water, steam & coolants 5
High purity & electronics 4
Rating here is about the elastomer's outgassing and extractables behaviour, not chemical attack.
Need a medium that is not listed? — 44 media are shown here. Send us the medium, concentration, temperature and duration and we will return a written assessment rather than a guess.
Need help selecting an FFKM compound?
Send your operating conditions or a drawing and our engineers will recommend a grade and confirm availability.