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TUBING & ROD
FEP Chemical Resistance Tubing & Rods
Material Scope
This data applies to Virgin (unfilled) FEP. Tubing, films, linings, and moulded components.
Not covered: Filled FEP grades. Composite or multilayer structures.
Filled grades may behave differently
How this data is created
- Chemical resistance ratings are compiled from:
- Polymer manufacturer technical data
- Independent industry chemical resistance charts
- Internal validation testing where required
- Testing and evaluation align with recognised plastics chemical resistance standards.
Disclaimer:
This information is provided for guidance only. No responsibility is accepted for its accuracy or completeness.
Material suitability must be verified by the user through appropriate testing for the intended application.
Reference Conditions
Unless otherwise stated, ratings are based on temperature of 23 °C (73 °F), continuous immersion exposure, duration of 7–30 days, and concentrations as listed.
Chemical resistance may reduce as temperatures approach the upper service limit of FEP.
Rating Definitions
| Rating | Meaning |
|---|---|
|
A – Excellent |
No significant change in properties
|
|
B – Good |
Minor change; suitable with engineering review
|
|
C – Limited |
Noticeable degradation; short-term use only
|
|
NR – Not recommended |
Chemical attack, swelling, or failure expected |
Acids
| Chemical | Concentration | 23°C | 100°C | Notes |
|---|---|---|---|---|
|
Hydrochloric Acid |
Up to 37% |
A |
B |
Temperature-limited performance |
|
Sulfuric Acid |
Up to 98% |
A |
C |
Reduced resistance at elevated temperature |
|
Nitric Acid |
≤70% |
A |
C |
Oxidising conditions reduce suitability |
|
Hyrdrofluoric Acid |
Any |
A |
B |
Suitable at moderate temperatures |
Alkali
| Chemical | Concentration | 23°C | 100°C | Notes |
|---|---|---|---|---|
|
Sodium hydroxide |
Any |
A |
B |
Temperature sensitive |
|
Potassium hydroxide |
Any |
A |
B |
Temperature sensitive |
Solvents
| Chemical | Concentration | 23°C | 100°C | Notes |
|---|---|---|---|---|
|
Acetone |
100% |
A |
B |
Softening at elevated temperature |
|
Toluene |
100% |
A |
B |
Lower temperature limit than PTFE/PFA |
|
MEK |
100% |
A |
B |
Suitable at moderate temperature |
|
Chlorinated solvents |
100% |
A |
B |
Temperature dependent |
Oxidising Agents
| Chemical | Concentration | 23°C | 100°C | Notes |
|---|---|---|---|---|
|
Wet chlorine |
– |
A |
C |
Elevated temperature limitation |
|
Fuming nitric acid |
>90% |
C |
NR |
Severe oxidising conditions |
|
Ozone |
– |
A |
A |
No Cracking |
Known Limitations
FEP is not recommended for continuous high-temperature service near its maximum operating limit, molten alkali metals, or elemental fluorine under extreme conditions.
Engineering Guidance
FEP offers broad chemical resistance with greater flexibility and transparency than PTFE and PFA, but with a lower maximum service temperature.
Application-specific review is recommended for elevated temperatures, pressure systems, thin-wall tubing, and repeated cleaning or sterilisation cycles.
Disclaimer:
This information is provided for guidance only. No responsibility is accepted for its accuracy or completeness.
Material suitability must be verified by the user through appropriate testing for the intended application.