Common materials for rubber end gaskets include nitrile rubber (NBR), silicone rubber, fluororubber (FKM), ethylene propylene diene monomer (EPDM), natural rubber (NR), and chloroprene rubber (CR). Each material has different performance characteristics to suit specific working conditions.
1. Nitrile Rubber (NBR)
- Characteristics: Excellent oil resistance, wear resistance, and good airtightness; it is one of the most commonly used sealing materials for oily media.
- Applications: Automotive engines, hydraulic systems, lubricating oil pipelines, and other environments containing mineral oil or fuel oil.
- Operating Temperature: -20℃~110℃.
- Caution: Not resistant to strong acids, strong oxidants, and polar solvents (such as ketones and esters).
2. Silicone Rubber (WMQ)
- Characteristics: Outstanding high and low temperature resistance, non-toxic and odorless, meets food-grade and medical-grade standards, and has good insulation properties.
- Applicable Scenarios: Food processing equipment, medical devices, electronic appliance sealing, and other fields with high safety requirements.
- Operating Temperature: -100℃~300℃, some models can withstand higher temperatures for short periods.
- Caution: Lower mechanical strength, not suitable for high-pressure or high-wear conditions.
3. Fluororubber (FKM)
- Characteristics: High temperature resistance, strong acid and alkali resistance, organic solvent resistance, and oxidizing media resistance; extremely high chemical stability.
- Applicable Scenarios: Chemical reactors, aerospace sealing, high-temperature corrosive fluid transport systems.
- Operating Temperature: -20℃~200℃, can withstand higher temperatures for short periods.
- Caution: Higher cost, typically used in extreme conditions.