How to Choose O-Ring Materials? NBR, Silicone, Viton & EPDM Explained
Choosing the right O-ring material is critical for sealing performance, chemical resistance, and durability. This guide explains the differences between NBR, Silicone, Viton (FKM), and EPDM to help you select the ideal rubber compound for your application.
🔧 Why Material Selection Matters
Improper material choice can cause:
Oil or fluid leakage
Rubber swelling, cracking, or hardening
Seal failure and equipment damage
🧪 Common O-Ring Materials Compared
| Material | Temp. Range | Key Features | Common Applications |
|---|---|---|---|
| NBR | -30°C ~ 100°C | Oil-resistant, low-cost | Hydraulic systems, auto parts |
| Silicone | -40°C ~ 200°C | Soft, food-safe, flexible | Food, medical, low-temp sealing |
| Viton (FKM) | -20°C ~ 200°C | Excellent chemical & heat resistance | Automotive, chemical processing |
| EPDM | -40°C ~ 130°C | Steam, water, ozone resistant | Drinking water, outdoor use |
✅ 4-Step Material Selection Guide
Temperature Requirements
High temp? Use Viton or Silicone.
Low temp? Go with Silicone or EPDM.Media Compatibility
Oil? → NBR or Viton
Acids/Chemicals? → Viton
Steam/Water? → EPDMRegulatory Needs
Food contact? → Silicone
Drinking water? → EPDMBudget
NBR is the most cost-effective.
Viton is premium but long-lasting.
🌟 Why Choose CNL O-Rings?
Wide material options: NBR, FKM, EPDM, Silicone & more
Custom sizes, FDA/NSF compliant formulas
In-stock inventory, global shipping
Trusted OEM supplier across industries
💡 Common Industries
Hydraulic & pneumatic systems
Food packaging machines
Automotive engine components
Plumbing and solar heating
📞 Need help choosing the right O-Ring?
Our engineering team at CNL offers free consultation and technical support.