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Fluorine Resistance of FEP

Is FEP compatible with Fluorine?

Compatibility Rating

At 20°C
A
Excellent
Excellent resistance - recommended for continuous use
At 50°C
B
Good
Good resistance - suitable for intermittent contact

Why is FEP resistant to Fluorine?

FEP shows excellent resistance to Fluorine due to its fully fluorinated structure similar to PTFE, offering near-universal chemical resistance.

⚠️ When NOT to use FEP

Avoid using FEP (Fluorinated Ethylene Propylene) with molten alkali metals and fluorine gas. Suitable up to 200°C.

Comparison Table — All Materials for Fluorine

Material20°C50°C
HDPEDD
LDPEDD
PPDD
PTFEAB
PVDFDD
FEPAB
ECTFE/ETFEAC
EPDMDD
Viton (FPM)CNR
NBRDD
SiliconeNRNR
SS 316DD
SS 304DD
AluminiumDD
PVC RigidAB
PVC FlexibleNRNR
PMPCD
PolystyreneDD
SANDD
PolycarbonateDD
PETGDD
Acetal (POM)DD
Nylon (PA)DD
PolysulfoneDD

A=Excellent · B=Good · C=Fair · D=Poor · NR=No Data

🌡️ Temperature Note

Good resistance at both 20°C and 50°C. Maximum service temperature for this material is 200°C — above this, degradation risk increases significantly.

🔄 Better Alternative?

Consider: PTFE for higher temps. View all materials for Fluorine →

FAQ

Is FEP resistant to Fluorine?

FEP has Excellent (A) resistance to Fluorine at 20°C.

Can I store Fluorine in FEP?

Yes, FEP is rated A for Fluorine.

All Materials for Fluorine All Chemicals for FEP