NBR vs FKM vs EPDM vs Silicone: Complete Rubber Comparison Guide 2026

Author: Site Editor Publish Time: 2026-05-25 Origin: Site

Choosing the right rubber material for industrial sealing can make or break your equipment’s performance. This comprehensive guide compares the four most-used elastomers across all key specifications.

Quick Comparison Table

Property	NBR	FKM	EPDM	Silicone
Temp Range	−35 to +120°C	−26 to +205°C	−45 to +150°C	−60 to +230°C
Oil Resistance	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐	⭐
Weather/Ozone	⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐
Steam/Hot Water	⭐	⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐
Cost	Lowest	Highest	Medium	Medium-High
Food Grade Avail.	Yes (NBR-FDA)	Limited	Yes	Yes (FDA, LFGB)

Detailed Analysis by Application

Automotive Sealing

Best: FKM or NBR — FKM for fuel systems and high-temp zones; NBR for engine oil and transmission seals where cost matters.

Outdoor & Weather Exposure

Best: EPDM — unmatched ozone and UV resistance. Ideal for roofing, window seals, and agricultural equipment.

Food & Medical

Best: Silicone (FDA/LFGB) — the only material safe for direct food contact across a wide temperature range.

Common Mistakes to Avoid

Using EPDM in petroleum oil → rapid swelling and failure
Using silicone in oil → swells and loses mechanical strength
Using NBR above 120°C → thermal degradation, hardening, cracking
Using standard FKM for steam → short service life; specify special steam-resistant grades

Cost Optimization Strategy

For cost-sensitive applications that don’t need premium performance, use the hierarchy: NBR → EPDM → Silicone → FKM. Only upgrade to a more expensive material when the application’s specific requirements demand it.