FKM vs NBR: Which Oil Seal Material Should You Choose?

Choosing the wrong oil seal material can cause leaks, failures, and costly downtime.

FKM offers superior performance in high heat and chemical resistance. NBR is more affordable and flexible in low-temperature environments.

Let’s break down how to compare them—by temperature, fluid compatibility, durability, and price.

What are the key differences between FKM and NBR oil seals?

Understanding performance gaps helps you pick the right material for the job.

FKM resists heat and chemicals better, while NBR performs well under moderate conditions and costs less.

FKM is ideal for fuel systems, chemical pumps, and high-speed motors. For general maintenance, NBR O-Rings remain the most popular choice.

Temperature extremes affect seal life and function.

FKM maintains shape and elasticity up to +205°C. NBR remains flexible down to -40°C, ideal for cold-weather equipment.

Material	Min Temp	Max Temp
FKM	-26°C	+205°C
NBR	-40°C	+120°C

If your system runs hot, FKM O-Rings will ensure longer service life.

FKM outperforms NBR in aggressive environments.

It resists oils, fuels, acids, and many solvents, while NBR is limited to petroleum-based fluids.

FKM O-Rings are often used in fuel injectors and chemical pumps, where failure isn’t an option.

NBR offers solid performance at low cost. FKM delivers premium protection but with higher upfront investment.

Material	Relative Cost	Lifespan
FKM	Higher	Long
NBR	Lower	Moderate

Looking for both economy and safety? Consider dual-material kits for mixed systems.

FKM excels in heat and chemical resistance; NBR wins on affordability and cold weather use.

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