### What is the difference between FKM and PTFE?
### Answer:
**1. What is FKM?**.
FKM, also known as fluoroelastomer, is a type of synthetic rubber that has excellent resistance to high temperatures, chemicals, oils, and fuels. It is commonly used in applications where resistance to harsh environments is necessary.
**2. What is PTFE?**.
PTFE, or polytetrafluoroethylene, is a synthetic fluoropolymer that is known for its low friction properties, resistance to chemicals, and high temperatures. It is often used in applications where non-stick properties are required.
**3. Difference between FKM and PTFE:**.
- **Material Composition:** FKM is a rubber-like material, while PTFE is a solid polymer.
- **Temperature Resistance:** FKM can withstand higher temperatures compared to PTFE. FKM can typically handle temperatures up to 400°F (200°C), while PTFE can withstand temperatures up to 500°F (260°C).
- **Chemical Resistance:** Both FKM and PTFE have excellent chemical resistance, but FKM is better suited for applications involving oils and fuels, while PTFE is often used in applications where the resistance to acids and solvents is crucial.
- **Friction Properties:** PTFE has a much lower coefficient of friction compared to FKM, making it an ideal material for applications where low friction is important.
- **Applications:** FKM is commonly used in seals, gaskets, and O-rings in automotive and aerospace industries, while PTFE is used in non-stick coatings, seals, and bearings in various industries.
In summary, FKM and PTFE are both excellent materials with unique properties that make them suitable for different applications. FKM is preferred for applications requiring high temperature and oil resistance, while PTFE is used in applications where low friction and chemical resistance are crucial.
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