FS- Rockshox Super Deluxe - C1 - Low Friction Xring - Damper Kit

Does not include: Piston Ring

NBR Quad Ring (X-Ring): Overview

NBR (Nitrile Butadiene Rubber) Quad Rings, also known as X-Rings, are specialized elastomeric seals designed with a four-lobed cross-section. This unique design improves performance compared to standard O-rings by reducing friction, increasing sealing efficiency, and minimizing twisting or rolling in dynamic applications. NBR is a synthetic rubber widely used for its excellent resistance to oils, fuels, and other non-polar solvents.

Quad rings are commonly used in applications requiring reliable dynamic sealing, such as hydraulic and pneumatic systems, pumps, and machinery.

Benefits of Dynamic NBR Quad Rings (X-Rings)

1. Improved Sealing Efficiency
   The four-lobed design of the X-ring creates multiple sealing lines, providing enhanced sealing performance compared to O-rings, especially under low-pressure conditions.

2. Low Friction
   The unique geometry reduces friction in dynamic applications, minimizing wear and heat generation during operation.

3. Resistance to Twisting
   Unlike O-rings, quad rings are less prone to twisting or spiraling in the groove, reducing the risk of premature failure in dynamic environments.

4. Good Oil and Fuel Resistance
   NBR has excellent compatibility with oils, fuels, and greases, making it suitable for hydraulic and automotive systems.

5. Wide Hardness Range
   NBR quad rings can be formulated in various hardness levels to suit specific application needs.

6. Affordable and Widely Available
   NBR is cost-effective compared to more specialized materials like FKM, making it a practical choice for many applications.

7. Temperature Range
   Standard NBR quad rings operate effectively in temperatures from -40°C to 120°C (-40°F to 248°F), making them versatile for moderate environments.

8. Abrasion Resistance
   NBR quad rings offer good resistance to abrasion, providing durability in dynamic applications with sliding or reciprocating motion.

Negatives of Dynamic NBR Quad Rings (X-Rings)

1. Limited Chemical Resistance
   While NBR resists oils and fuels, it is not compatible with certain chemicals such as strong acids, ketones, or chlorinated solvents.

2. Moderate Temperature Resistance
   NBR does not perform well in extreme high-temperature applications (above 120°C or 248°F) or low-temperature environments (below -40°C), where brittleness or degradation may occur.

3. Swelling in Polar Fluids
   Exposure to polar solvents, water, or steam can cause swelling, compromising the seal's effectiveness.

4. Wear in High-Friction Applications
   Although the quad ring design reduces friction compared to O-rings, NBR is less wear-resistant than materials like polyurethane in highly abrasive or heavy-duty environments.

5. Compression Set
   NBR is more prone to compression set than materials like FKM or polyurethane, meaning it may lose its ability to rebound after prolonged compression.

6. UV and Ozone Sensitivity
   NBR degrades when exposed to ozone, UV light, or weathering, limiting its use in outdoor or exposed environments.

Applications of Dynamic NBR Quad Rings (X-Rings)

• Hydraulic and pneumatic cylinder seals
• Automotive fuel and oil systems
• Pumps, valves, and compressors
• General industrial machinery requiring low-friction dynamic seals
• Low- to medium-pressure dynamic applications

Conclusion

NBR quad rings (X-rings) provide enhanced sealing performance and reduced friction in dynamic applications compared to traditional O-rings. They are an affordable option with good oil and fuel resistance, making them ideal for hydraulic, pneumatic, and automotive systems. However, their limited chemical resistance, moderate temperature range, and sensitivity to UV/ozone require careful consideration when selecting them for demanding or exposed environments.