Nitrile O-rings, also known as Buna-N or NBR O-rings, are one of the most commonly used types of seals in various industries due to their excellent resistance to oil, fuel, petroleum oil and other fluids, as well as their cost-effectiveness. Nitrile O-rings find extensive use in engines, gearboxes, aircraft pumps, and various water-related applications.
Nitrile O-rings serve as effective face-to-face or shaft seals, accommodating both rotary and linear movements. They boast commendable tear and abrasion resistance, with an operational temperature range from -30°C to +120°C.
Note: Nitrile / Buna / NBR O-Rings do have limitations to ozone, sunlight and weathering. They are also not good in strong acids, aircraft or automobile brake systems, or ketones.
Nitrile O-Ring Properties:
| Item | NBR | Test Method |
| Color | Black | |
| Specific gravity | 1.35/cm3 | ASTM D297 |
| Hardness | 70+/- 5 Shore A | ASTM D2240 |
| Tensile strength | 9 MPa (min) | ASTM D412 |
| Elongation at break | 350% (min) | ASTM D412 |
| Size | Varies | |
| Compression set 100°C 22 hrs | 13-25% | ASTM D 395B |
| Tear resistance | 25 kg/cm (min) | ASTM D624 |
| Temperature range | -30°C to +120°C |
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