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FKM vs NBR O-Rings
FKM vs NBR O-Rings
FKM and NBR are two of the most commonly used O-ring materials in industrial sealing applications. Understanding the differences between FKM vs NBR O-rings helps engineers and buyers select the most suitable material for their operating conditions.
Overview of FKM and NBR O-Rings
Both FKM (fluoroelastomer) and NBR (nitrile rubber) offer excellent sealing performance, but they differ significantly in temperature resistance, chemical compatibility, and cost.
FKM vs NBR O-Rings Comparison Chart
| Property | FKM (Viton®) O-Rings | NBR (Buna-N) O-Rings |
|---|---|---|
| Temperature Range | -20°C to +200°C | -40°C to +120°C |
| Oil & Fuel Resistance | Excellent | Very Good |
| Chemical Resistance | Excellent (acids, solvents) | Moderate |
| Compression Set | Low | Moderate |
| Cost | Higher | Lower |
Advantages of FKM O-Rings
- Superior heat resistance
- Excellent chemical compatibility
- Long service life in harsh environments
- Ideal for oil, fuel, and solvent exposure
Advantages of NBR O-Rings
- Cost-effective sealing solution
- Excellent oil and fuel resistance
- Good mechanical strength
- Wide availability of standard sizes
Which Should You Choose: FKM or NBR?
The choice between FKM and NBR O-rings depends on your application requirements:
- Choose FKM for high temperature or aggressive chemical environments
- Choose NBR for general oil sealing at lower cost
- Consider pressure, temperature, and fluid compatibility
Hardness and Size Availability
Both FKM and NBR O-rings are available in multiple hardness grades and standard sizes.
- Hardness range: 60 – 90 Shore A
- Available in AS568 and metric sizes
Refer to our O-Ring Hardness Chart and Standard O-Ring Size Overview for detailed guidance.
Custom O-Rings & OEM Manufacturing
We provide both FKM and NBR O-rings in standard and custom dimensions, hardness, and colors. OEM and bulk orders are supported with strict quality control.