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Choosing the right materials for seals and gaskets is crucial for ensuring resistance to chemical attack. Here are some of the most commonly used materials known for their chemical resistance:

### 1. **Fluoroelastomers (FKM)**
- **Description**: Commonly known by the brand name Viton, fluoroelastomers are highly resistant to a wide range of chemicals, including oils, fuels, and solvents.
- **Applications**: Suitable for high-temperature and aggressive chemical environments.

### 2. **Polytetrafluoroethylene (PTFE)**
- **Description**: Known for its excellent chemical resistance and low friction properties, PTFE is non-reactive and withstands a wide temperature range.
- **Applications**: Often used in gaskets and seals for corrosive chemicals and food processing.

### 3. **Polyurethane (PU)**
- **Description**: Polyurethane seals offer good abrasion resistance and can withstand certain chemicals, including some oils and solvents.
- **Applications**: Suitable for applications where flexibility and durability are required.

### 4. **Nitrile Rubber (NBR)**
- **Description**: Nitrile rubber is resistant to petroleum-based oils and fuels but can be less effective against certain chemicals.
- **Applications**: Commonly used in automotive and industrial applications but may not be suitable for strong acids or bases.

### 5. **Silicone Rubber**
- **Description**: Silicone materials can withstand high temperatures and have good resistance to water and some chemicals, although they are less effective against oils and solvents.
- **Applications**: Often used in food processing and medical applications due to their non-toxicity.

### 6. **Ethylene Propylene Diene Monomer (EPDM)**
- **Description**: EPDM is resistant to heat, ozone, and weathering, making it suitable for outdoor applications. It has limited resistance to petroleum-based products.
- **Applications**: Commonly used in automotive and HVAC applications.

### 7. **Aflas (TFE/P)**
- **Description**: Aflas is a type of fluoropolymer that offers excellent resistance to a variety of chemicals, including acids and bases.
- **Applications**: Used in applications involving aggressive chemicals and high temperatures.

### 8. **Glass-Filled PTFE**
- **Description**: This material combines PTFE with glass fibers to enhance strength and wear resistance while maintaining chemical inertness.
- **Applications**: Suitable for applications requiring high strength and chemical resistance.

### 9. **Metallic Seals (e.g., Copper, Stainless Steel)**
- **Description**: For extreme applications, metallic seals can provide excellent resistance to high pressures and temperatures, as well as chemical attack.
- **Applications**: Often used in high-pressure and high-temperature environments.

### Conclusion

Selecting the appropriate material for seals and gaskets based on chemical resistance is essential for ensuring longevity and reliability. Consider the specific chemicals the seals will be exposed to, as well as the operating conditions, to choose the best material for your application.
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