FKM, EPDM, and NBR are three of the most commonly used rubber materials in industrial sealing applications. Each offers distinct performance characteristics and is suitable for specific operating environments. Choosing the right material can significantly impact the durability, sealing performance, and cost-effectiveness of rubber parts.
✅ 1. Oil Resistance: FKM Takes the Lead
- FKM (fluoroelastomer) offers superior oil resistance, especially under high temperatures and in contact with fuels, lubricants, and synthetic oils.
- NBR (nitrile rubber) provides good oil resistance but is more suitable for moderate temperatures and mineral oils.
- EPDM (ethylene propylene diene monomer) lacks oil resistance and is ideal for non-oily applications.
✅ 2. Heat Resistance: FKM Performs Best
- FKM withstands continuous high temperatures up to 200–250°C, making it ideal for engine compartments and other heat-intensive areas.
- EPDM generally handles up to 130°C and performs well with hot water or steam.
- NBR has a narrower temperature range, typically from -40°C to 120°C.
✅ 3. Weather & Ozone Resistance: EPDM Excels
- EPDM shows outstanding resistance to aging, ozone, UV, and weathering, making it ideal for outdoor seals, solar equipment, and construction use.
- FKM also provides good weather resistance but comes with a higher price tag.
- NBR performs poorly in outdoor environments and is not recommended for long-term outdoor exposure.
✅ 4. Chemical Resistance: FKM Outperforms
- FKM offers excellent resistance to a wide range of aggressive chemicals, acids, and solvents—ideal for chemical processing, fuel systems, and aerospace industries.
- EPDM maintains stability in extreme pH conditions but is less resistant to solvents.
- NBR handles most oils and some solvents but does not resist strong acids or bases effectively.
✅ 5. Flexibility & Elasticity: EPDM & NBR Perform Well
- EPDM and NBR offer excellent flexibility and rebound, especially in low-to-medium temperature settings.
- FKM is comparatively stiffer and loses flexibility at very low temperatures.
✅ 6. Cost Comparison: NBR is Most Cost-Effective
- NBR is the most cost-effective among the three and is suitable for mass applications and short-cycle projects.
- EPDM is moderately priced and fits most general industrial uses.
- FKM, being the most expensive, is reserved for high-performance or critical sealing applications.
Summary Table
| Property | FKM | EPDM | NBR |
| Oil Resistance | ★★★★☆ | ★☆☆☆☆ | ★★★☆☆ |
| Heat Resistance | ★★★★★ | ★★★☆☆ | ★★☆☆☆ |
| Weatherability | ★★★★☆ | ★★★★★ | ★☆☆☆☆ |
| Chemical Resist | ★★★★★ | ★★★☆☆ | ★★☆☆☆ |
| Flexibility | ★★☆☆☆ | ★★★★☆ | ★★★★☆ |
| Cost Efficiency | Highest | Medium | Lowest |
💡 How to Choose the Right Rubber Material?
When selecting rubber materials for sealing parts, it’s important to consider media compatibility, temperature range, indoor/outdoor usage, and budget.
For instance:
- Need high-temperature & chemical resistance? → Choose FKM
- Long-term outdoor exposure? → Go with EPDM
- Oil resistance + low cost? → NBR is the best choice
🚀 Why Choose OKIN Rubber Sealing Products?
- ✅ Premium raw materials for stable and reliable sealing
- ✅ Custom shapes and sizes available on request
- ✅ Multiple material options for different conditions
- ✅ Specialized in B2B wholesale, fast bulk delivery
- ✅ Proven track record in global export and customer satisfaction