Rubber elastomers
NBR is one of the most used elastomers in the sealing industry
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 NBR elastomers
Good resistance | Average 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
- Wipers for special instance
- Piston and road seals
- Rotary seals
- O-Rings
NBR Material Data Sheet
Properties | Value | Unit | Standard |
|---|---|---|---|
Hardness at 20°: | 85 +/-2 | Shore A | DIN 53505 |
Density: | 1,32 | g/cm³ | DIN ISO 1183-1 |
100% Modulus: | >10 | N/mm² | DIN 53504 |
300% Modulus: | / | N/mm² | DIN 53504 |
Tensile strength: | >16 | N/mm² | DIN 53504 |
Elongation at break: | >200 | % | DIN 53504 |
Rebound resilience: | >25 | % | DIN 53512 |
Tear strength: | >6 | N/mm² | DIN ISO 34-1 |
Abrasion: | <90 | mm³ | DIN 53516 |
Compression set:* | <10 | % | DIN ISO 815-1 |
Compression set:** | <10 | % | DIN ISO 815-1 |
Compression set:*** | <15 | % | DIN ISO 815-1 |
Min. service temperature: | -30 | °C | |
Max. service temperature (short term): | +100 (+120) | °C |
*Compression set @ 23°C, 72 hours, 10% deflexion
**Compression set @ 70°C, 24 hours, 20% deflexion
***Compression set @ 100°C, 24 hours, 20% deflexio
All above established data results from random tests which were taken from the functioning production. All data was stated based on standard test-products in accordance with ISO, DIN and ASTM standards and can substantially not be extended to the completed seal. Our practical technical recommendation, either oral, written or through tests is given in conformity with our best knowledge. However, this data is to be regarded as non-obligatory advice, also taking into consideration any protective rights of a third party, and does not acquit you from making tests with our product in relation to its adaptability for the assigned process and intendment. Utilization, application and processing of the products befall completely outside of our control and are therefore solely your liability. As regards the responsibility, it will be limited to all damages in the value of the product which we delivered and you applied. Certainly, we do assure the immaculate quality of our products in concordance with our general sales and delivery conditions.