Choose the Right Material: NBR vs EPDM

Introduction

Selecting the correct rubber compound is the most critical step in product design. The debate often comes down to NBR vs EPDM. While both are synthetic rubbers, they serve opposite purposes. Understanding the difference between NBR vs EPDM prevents costly seal failures.

1. Definitions

• NBR (Nitrile): Acrylonitrile Butadiene Rubber. Famous for oil resistance.

• EPDM: Ethylene Propylene Diene Monomer. Famous for weather/UV resistance.

2. Key Differences (Why Use Which?)

The main deciding factor in NBR vs EPDM is the operating environment. If fuel or oil is present, NBR is required. If sunlight and weather are the main factors, EPDM is required.

3. Technical Comparison

Property	NBR (Nitrile)	EPDM
Oil/Fuel Resistance	Excellent	Poor (Swells)
Weather/UV Resistance	Poor (Cracks)	Excellent
Temperature Range	-40°C to +108°C	-50°C to +150°C

4. How to Choose

• Scenario A: You are sealing a fuel tank. -> Choose NBR.

• Scenario B: You are sealing a window on a vehicle. -> Choose EPDM.

5. Applications

Material	Common Industry	Specific Part
NBR	Automotive Powertrain	Oil seals, fuel hoses
EPDM	Automotive Body	Weatherstripping, brake systems (non-oil based)

6. FAQ

• Q: What happens if I use EPDM for gasoline?

  A: The EPDM will absorb the gasoline, swell significantly, and eventually disintegrate.

• Q: Is NBR cheaper than EPDM?

  A: They are generally comparable in price, though specialized formulations vary.

7. Conclusion

Correctly identifying the application requirements for NBR vs EPDM ensures safety and performance. Consult authoritative resources likeSAE Internationalfor material standards.

8. About Fuqiang

Not sure which material fits your needs? Fuqiang offers expert consultation on material selection and custom manufacturing.