Freudenberg Nitrile Buna-N (NBR) Material Description:
NBR (acrylonitrile-butadiene-rubber) is a polymer of butadiene and acrylonitrile (ACN). The proportion of acrylonitrile can be between 18% and 50% and significantly affects the properties of the polymer. Thus, an NBR with a low acrylonitrile content is characterized by a very good low-temperature flexibility and good elastic properties. The higher the ACN content, the better the resistance against polar media.
NBR has very good properties in applications with mechanical stress and in oils, fats and waxes. Its temperature resistance in hot water is up to +100 °C (+212 °F). NBR cannot be used in concentrated acids (e.g. nitric acid, formic acid), concentrated oxidizing media (e.g. peracetic acid), and in aromatic and chlorinated hydrocarbons.
Freudenberg Seal Distributor
Engineered Seal Products is proud to be a "Freudenberg North American Preferred Partnered":
- Involvement of engineering services and technical material know-how from Freudenberg Sealing Technologies
- Highest technical seal competence through qualified training and certified sealing know-how
- Efficient and speedy cross-linked processes with Freudenberg Sealing Technologies
- High and quick availability assuring a reliable delivery performance
- Very good abrasion resistance
- The acrylonitrile content must be selected for each application in such a way that the material shows the optimal combination of chemical resistance and low-temperature flexibility
- Good mineral oil and fuel resistance and outstanding resistance to vegetable and animal oils, silicones, as well as to diluted acids and alkaline solutions at room temperature
- NBR tends to swell in aromatic and chlorinated hydrocarbons, as well as in polar solvents
- Temperature-resistant from –30 °C to +100 °C (–22 °F to +212 °F), special blends remain flexible at low temperatures down to –55 °C (–67 °F)
| ASTM D1418 Abbreviation |
| NBR |
| ESP Recommended Shelf Life |
| 15 Years |
| Hardness (Shore A) Range |
| 65 - 93 |
Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.
ESP’s shelf life recommendation is based on the AS5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture to the time of assembly.