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O-Ring Material Properties
O-Ring Material Properties
O-ring material properties determine sealing performance under different temperatures, pressures, and chemical environments. Selecting the correct elastomer material is critical for long-term reliability and safety in industrial applications.
Why O-Ring Material Selection Matters
Each O-ring material has unique physical and chemical properties. Choosing the wrong compound may result in swelling, hardening, cracking, or premature seal failure.
- Operating temperature range
- Chemical compatibility
- Pressure resistance
- Hardness and elasticity
Common O-Ring Materials Overview
The table below outlines the most commonly used O-ring materials and their typical performance characteristics.
NBR (Buna-N) O-Rings
- Excellent resistance to oils and fuels
- Temperature range: -40°C to +120°C
- Cost-effective for general industrial use
FKM (Viton®) O-Rings
- Outstanding chemical and heat resistance
- Temperature range: -20°C to +200°C
- Ideal for high-temperature and oil-resistant applications
EPDM O-Rings
- Excellent resistance to water, steam, and weathering
- Temperature range: -50°C to +150°C
- Not suitable for petroleum oils
Silicone O-Rings
- Very wide temperature range
- Temperature range: -60°C to +200°C
- Excellent flexibility at low temperatures
HNBR (HSN) O-Rings
- Improved heat and chemical resistance vs NBR
- Temperature range: -30°C to +150°C
- High mechanical strength and abrasion resistance
FFKM O-Rings
- Highest chemical and temperature resistance
- Temperature range: up to +325°C
- Used in semiconductor, aerospace, and chemical processing
Material Hardness (Durometer)
O-ring hardness is measured in Shore A durometer. Common hardness ranges from 60 to 90 Shore A depending on sealing requirements.
Refer to our O-Ring Hardness Chart for detailed guidance.
Chemical Compatibility & Performance
Chemical exposure can significantly affect O-ring performance. Always verify material compatibility with the operating fluid or gas.
Explore our Chemical Compatibility Guide to select the right compound.
Need Help Selecting the Right Material?
Our engineering team supports material selection for standard and custom O-ring applications. We offer OEM solutions with full quality control and documentation.