The Oring Cord NBR 200 mm is a robust sealing component used across mechanical, hydraulic, and pneumatic assemblies. Manufactured from nitrile butadiene rubber, this cord provides reliable compression set resistance and dimensional stability in demanding environments.
Engineers select this size and material to balance chemical compatibility, temperature range, and installation space. Below is a concise reference to support specification and procurement decisions.
| Product | NBR Oring Cord 200 mm | Key Specification |
|---|---|---|
| Material | Nitrile Butadiene Rubber (NBR) | Good oil and fuel resistance |
| Cross Section | Cord, typically 1.5–3.0 mm | Defined per application pressure |
| Inner Diameter | 200 mm | Nominal ID for housing selection |
| Temperature Range | -30°C to +120°C | Short-term peaks to +150°C possible |
Material Compatibility and Chemical Resistance
NBR offers dependable sealing performance where oils, fuels, and greases are present. Understanding resistance levels helps prevent early failures in dynamic systems.
Key Media Resistance
- Mineral oils and hydraulic fluids: Excellent
- Fuels and aromatics: Good
- Acids and alkalis: Limited, requires gland design review
- Ozone and weathering: Moderate, protective coating recommended
Mechanical Performance and Installation
Proper gland fill ratio and compression ensure sealing without excessive friction. The 200 mm ID cord fits standard mold or cut lengths, enabling quick retrofit in legacy equipment.
Installation Checks
- Verify groove dimensions against manufacturer data
- Lubricate cord before insertion to reduce damage
- Avoid twists or kinks that initiate premature wear
Temperature and Durability Limits
Operating within the recommended temperature band preserves elasticity and prevents hardening. Continuous service above ratings can lead to compression set and loss of sealing integrity.
Guidelines
- Keep below +120°C for long-term life
- Brief exposure to +150°C is acceptable in non-critical cycles
- Low temperatures down to -30°C retain flexibility
Design Considerations and Standards
Selecting the right cord diameter and material involves pressure, motion speed, and media type. Reference standards and supplier data sheets help avoid field issues.
| Parameter | Typical Value | Impact on Application | Verification Method |
|---|---|---|---|
| Hardness | Shore A 70–90 | Higher hardness resists extrusion in high pressure | Durometer test |
| Compression Set | <20% after 22h at 70°C | Indicates recovery and long-term sealing | ASTM D395 Method B |
| Tensile Strength | 10–15 MPa | Resistance to pull during installation | ASTM D412 |
| Elongation at Break | 200–300% | Ability to stretch over grooves | ASTM D412 |
Maintenance and Lifecycle Management
Inspection intervals and replacement schedules reduce unplanned downtime. Monitoring system performance and visual checks extend reliability for Oring Cord NBR 200 mm components.
Recommended Practices
- Inspect seals during routine shutdowns
- Replace if swelling, cracking, or permanent set observed
- Document temperature and pressure history for trend analysis
Operational Best Practices and Recommendations
Implementing consistent handling and installation routines maximizes the service life of the Oring Cord NBR 200 mm across varied machinery.
- Verify fluid compatibility before finalizing materials
- Follow groove geometry specifications from standards or OEM data
- Use correct tension and lubrication during installation
- Schedule periodic reviews of temperature and pressure logs
FAQ
Reader questions
Is the Oring Cord NBR 200 mm suitable for high-pressure hydraulic systems?
Yes, when selected with appropriate hardness and groove design, it handles demanding hydraulic pressures common in mobile and industrial equipment.
What causes premature failure of this sealing cord in the field?
Excessive temperature, incompatible fluids, and incorrect installation leading to twisting or insufficient compression are primary causes.
Can this cord be used in outdoor applications exposed to UV?
Prolonged UV exposure can degrade NBR; using covers or choosing UV-stabilized grades improves longevity in outdoor settings.
How does cord diameter affect sealing performance in dynamic motion?
Larger diameters increase sealing force but also friction; selecting the correct balance reduces wear while maintaining reliable containment.