Product Overview
KAFLON® AS568 NBR90 Back Up Rings are designed to support O-rings in high-pressure sealing systems, preventing extrusion into clearance gaps and improving overall sealing performance.
Manufactured from 90 Shore A NBR (nitrile rubber), these backup rings offer excellent mechanical strength, wear resistance, and oil compatibility, making them ideal for hydraulic and pneumatic applications.
Designed in accordance with AS568 standard sizes, these rings ensure easy integration with standard O-ring grooves and sealing systems.
Key Features
- Prevents O-ring extrusion under high pressure
- High mechanical strength (90 Shore A hardness)
- Excellent oil and hydraulic fluid resistance
- Improves sealing reliability and service life
- Compatible with standard AS568 O-rings
- Suitable for static and dynamic sealing systems
Material Specifications
| Property | Value |
|---|---|
| Material | NBR (Nitrile Rubber) |
| Hardness | 90 Shore A |
| Temperature Range | -30°C to +100°C |
| Oil Resistance | Excellent |
| Color | Black |
Optional options:
Different hardness levels (85–95 Shore A)
Custom compounds for specific fluids
Alternative materials (PTFE, FKM, HNBR)
-
Prevent seal extrusion under high pressure
-
Maintain sealing integrity in large clearance gaps
-
Extend O-ring service life
-
Improve system reliability
Advantages vs Standard O-Ring Sealing
| Feature | O-Ring Only | With Back Up Ring |
|---|---|---|
| High-pressure capability | Limited | Excellent |
| Extrusion resistance | Low | High |
| Service life | Medium | Extended |
| Reliability | Moderate | High |
Typical Industry Applications
KAFLON® AS568 NBR90 Back Up Rings are widely used in:
Hydraulic cylinders and piston systems
High-pressure valves and pumps
Industrial hydraulic equipment
Oil & gas sealing systems
Pneumatic systems
These applications require reliable sealing performance under high pressure and dynamic conditions
FAQ
1. What is a back up ring used for?
2. Why choose NBR 90 Shore A material?
3. Can back up rings be used in dynamic applications?
4. Are AS568 sizes standard?
5. What is the typical lead time?
Custom orders: 3–4 weeks
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