Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| concentration not stated | B* | – |
* estimated rating, given in the source without a temperature
Material comparison at 20 °C
Resistance overview
FEP shows good but limited resistance (B) to Pyridine at 20 °C. The material can be used in contact with this chemical, but minor effects such as slight swelling or a small reduction in mechanical properties may occur over extended exposure periods. Regular inspection of components in service is advisable. The rating remains stable between 20 °C and 50 °C, which means this material can also handle moderately elevated process temperatures without additional risk.
Application context
Pyridine is commonly encountered in pharmaceutical manufacturing and electronics cleaning. FEP (Fluorinated ethylene propylene) is a fluoropolymer typically used for seals, gaskets, valve seats and lined equipment. Since Pyridine is flammable, material selection must also consider the risk of static charge buildup and the need for proper grounding in storage and transfer systems.
Practical recommendation
FEP is suitable for use with Pyridine under normal conditions, but some minor effects on the material are expected over time. Periodic monitoring for swelling, softening, or weight change is recommended, especially for long-service components. For safety-critical or long-life applications, consider HDPE, Nylon (PA), Acetal (POM) instead, which are rated A for this chemical.
Did you know?
Fluorinated ethylene propylene was first developed in the 1960s and remains one of the most widely used fluoropolymers in chemical handling equipment.
Materials rated A or B at 20 °C
- Thermoplastics
- HDPE A, Nylon (PA) A, Acetal (POM) A
- Fluoropolymers
- PTFE A, PVDF A, ECTFE/ETFE A
- Metals
- SS 316 A, SS 304 A, Aluminium A
About FEP
FEP has nearly the chemical resistance of PTFE and can be melt-processed. Its service temperature, about 200 °C, is lower than that of PTFE.
Rating scale
- A very good resistance
- B good resistance
- C limited resistance
- D not resistant
- – no data
- K no general statement possible
A rating marked * is an estimate in the source, not a test result. An estimate is given as one value without a temperature.
About this data
The ratings come from the chemical resistance list published by Bürkle GmbH, which compiled them from raw-material manufacturers’ data. They describe laboratory tests on the raw material at 20 °C and 50 °C.
A finished part also sees pressure, mechanical stress, welds and mixtures that a laboratory test does not. Treat the rating as a first filter and test under your own conditions before relying on it.