Color - black
NBR is an elastomer based on acrylonitrile-butadiene rubber. This material has a high resistance to mineral oils and lubricants, HFA, HFB and HFC hydraulic fluids. NBR is not resistant to glycol based break fluids, to aromatic hydrocarbons (for example, toluene, benzol), esters, ketones, amines and concentrated acids. This elastomer has low ozone, weather and ageing resistance. Swelling in mineral oils is low, but depends very much on the composition of the oil.
NBR filled with soot and is not suitable for electrical insulation
NBR possess high hardness and for rubber elastomer has a very high resistance to abrasion (90mm³). Temperature limit: from -30°C up to +100°C (short time up to +120°C). At high temperatures the process of ageing speeds up, therefore the material becomes hard and fragile. The process of ageing starts in the atmosphere at 80°C, the ageing considerably slows down when reducing the inflow of hot air (for example, in hot oil).
Resistance
| Good resistance | Medium resistance | Low resistance |
| Mineral oils | 40% aromat. fuils (leaded fuils) | Aromatic hydrocarbon (toulene, benzol) |
| Aliphatic hydrocarbons (propane, butane) | Biodegradable hydraulic fluid | Chlorinated hydrocarbones (trichloroethylene) |
| Water | – | Brake fluids based on glycol |
| Fire-resistant pneumatic fluids HFA, HFB, HFC | Silicone oil and grease (oils can cause the decrease) | Fire-resistant pneumatic fluids HFD |
| Adipose and vegetable oils | – | Acetone, acetic acid ethyl esters |
| Diesel petrol | – | – |
| Big amount of dilute acids and bases, salines at room temperature. | - | - |
Application
NBR can be used for production of rod seals, piston seals, non-standard seals (special seals) and other components. NBR is mainly used in cases, where high fuel and mineral oil resistance, high elasticity and low residual strain are required, i.e. in sealing technologies, where «soft seal» is required, but NBR has a lower hardness than TPU, thus sealing out of this material have a lower resistance to extrusion with the same design. To operate at high pressures, seals NBR should be complemented by protection (supporting) elements, named "Back-up Rings". Seals out of NBR, compared with seals of the TPU, allow a short "run dry" and can work in a more abrasive work environments, such as in high dust content in cement production. Rotary seals out of NBR may be used at higher shaft speeds than seals out of TPU, approximately doubled.
Main use
NBR Material Data Sheet
| Properties | Value | Unit | Standard | |
| Hardness | 85 | Sh A | DIN 53505 | |
| Density | 1,317 | g/cm³ | DIN 53479 or DIN EN ISO 1183-1 | |
| Compression set 23°C / 72 h | 6,4 | % | DIN 53517 or DIN ISO 815-1 | |
| Compression set 70°C / 24 h | 6,2 | % | DIN 53517 or DIN ISO 815-1 | |
| Compression set 100°C / 24 h | 12 | % | DIN 53517 or DIN ISO 815-1 | |
| 100 % modulus | 8,8 | MPa | DIN 53504 | |
| Rebound resilience | 25 | % | DIN 53512 | |
| Tensile strength | 15,2 | MPa | DIN 53504 | |
| Elongation at break | 226 | % | DIN 53504 | |
| Tear strength | 5,4 | N/mm | DIN 53515 or DIN ISO 34-1 A | |
| Abrasion | 90 | mm³ | DIN 53516 | |
| Min. service temperature | -30 | °C | ||
| Max. service temperature | +100 | °C |
