Compatibility Rating
📊 Note: Formic Acid resistance varies by concentration. Data available for: 3 %, 50 %, 98-100 %. Search for specific concentrations →
Why is FEP resistant to Formic Acid?
FEP shows excellent resistance to Formic Acid 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 Formic Acid
| Material | 20°C | 50°C |
|---|---|---|
| HDPE | A | A |
| LDPE | A | B |
| PP | A | B |
| PTFE | A | A |
| PVDF | A | A |
| FEP | A | A |
| ECTFE/ETFE | A | A |
| EPDM | C | NR |
| Viton (FPM) | C | C |
| NBR | D | D |
| Silicone | NR | NR |
| SS 316 | A | A |
| SS 304 | A | B |
| Aluminium | C | C |
| PVC Rigid | B | C |
| PVC Flexible | NR | NR |
| PMP | A | B |
| Polystyrene | A | B |
| SAN | NR | NR |
| Polycarbonate | A | B |
| PETG | A | NR |
| Acetal (POM) | B | D |
| Nylon (PA) | C | D |
| Polysulfone | B | B |
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 Formic Acid →
FAQ
Is FEP resistant to Formic Acid?
FEP has Excellent (A) resistance to Formic Acid at 20°C.
Can I store Formic Acid in FEP?
Yes, FEP is rated A for Formic Acid.
📊 Note: Formic Acid resistance varies by concentration. Data available for: 3 %, 50 %, 98-100 %. Search for specific concentrations →