Nitrile / NBR (Acrylonitrile butadiene)
Nitrile, chemically, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content varies in commercial products from 18% to 50%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases. Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -35°C to +120°C (-30°F to +250°F), nitrile is the most widely used elastomer in the seal industry today. Also many military rubber specifications for fuel and oil resistant O-rings require nitrile based compounds. It should be mentioned that to obtain good resistance to low temperature, it is often necessary to sacrifice some high temperature resistance. Nitrile compounds are superior to most elastomers with regard to compression set, tear, and abrasion resistance. Nitrile compounds do not possess good resistance to ozone, sunlight, or weather. They should not be stored near electric motors or other ozone generating equipment. They should be kept from direct sunlight. However, this can be improved through compounding. NBR is the standard material for hydraulics and pneumatics. NBR resists oil-based hydraulic fluids, fats, animal and vegetable oils, flame retardant liquids (HFA, HFB, HFC), grease, water, and air. Special low-temperature compounds are available for mineral oil-based fluids. By hydrogenation, carboxylic acid addition, or PVC blending, the nitrile polymer can meet a more specified range of physical or chemical requirements.
The quality of Nitrile-compounds depends on the percentage of acrylonitrile in the base polymer. The following table indicates the change of properties as a function of acrylonitrile content.
| Compound number | Elastomer | Hardness IRHD ±5 | Description / Application | Certificates | Colour | Temp °C |
|---|---|---|---|---|---|---|
| NBR 366304 (475kB) |
Nitrile-NBR | 60 | with medium ACN content, Excellent resistance to aliphatic hydrocarbons, mineral oils, greases, vegetable and animal oils/greases, heating oil and diesel fuel | black | -30 / +120 | |
| NBR 366312 (511kB) |
NBR |
60 |
Excellent resistance to aliphatic hydrocarbons, mineral oils, greases, vegetable and animal oils, heating oil and diesel fuel. |
FDA 177-2600 ADI, 3A, EC1935/2004, metal detectable |
blue |
-30 / +120 |
| NBR 36624 (475kB) |
Nitrile-NBR | 70 | with medium percentage of acrylonitrile. Standard compound with good compression set values for contact with hydraulic fluids | black | -30 / +120 | |
| NBR 366470 (508kB) |
Nitrile-NBR | 70 | with medium percentage of Acrylonitrile/ Migration tested |
FDA 177.2600 |
black | -25 / +120 |
| NBR 36625 (500kB) |
Nitrile-NBR | 70 | Nitrile compound with medium percentage of Acrylonitrile. Good compression set values for contact with gasses and hydraulic fluids | EN 549 | black | -30 / +120 |
| NBR 366301 (475kB) | Nitrile-NBR | 70 | a medium Nitrile compound for industrial use. It is the standard cord compound. | black | -30 / +115 | |
| NBR 32770 (569kB) |
Buna-N | 70 | for gas applications | NEN 7212 GasTec QA, ECE 67R01 | black | -30 / +120 |
| NBR 366300 (518kB) | Buna-N | 70 | for gas applications | DVGW/EN549 | black | -20 / +80 |
| NBR 366005 (475kB) |
Nitrile-NBR | 70 | designed for the automotive industry | VW 2.8.1-A70 | black | -30 / +120 |
| NBR 366006 (475kB) |
Nitrile-NBR | 70 | designed for the automotive industry | VW 2.8.1-C70 | black | -30 / +120 |
| NBR 366001 (475kB) |
Nitrile-NBR | 70 | designed for the contact with ozone and preserving the good NBR-quality in contact with oils | black | -30 / +100 | |
| NBR 36624 X-Ring (478kB) |
Nitrile-NBR |
70 |
Nitrile compound with medium percentage of acrylonitrile. Standard compound with good compression set values for contact with hydraulic fluids |
black |
-30 / +120 |
|
| NBR 366185 (475kB) |
NBR | 75 | with medium percentage of ACN. Cure system is sulphur | black |
-20 / +120 |
|
| NBR 366302 (509kB) |
NBR | 75 | With medium percentage of ACN. Cure system is Peroxide. | FDA 177.2600 3A class II ADI, 1935/2004 |
black | -30 / +120 |
| NBR 366472 (508kB) |
Nitrile-NBR | 75 | Nitrile compound with medium percentage of Acrylonitrile | FDA 177.2600, ADI, EC1935/2004 | white | -30 / +120 |
| NBR 44601 (475kB) |
Nitrile-NBR | 80 | medium percentage of Acrylonitrile. Standard compound with good compression set values for contact with hydraulic fluids | black | -30 / +120 | |
| NBR 366480 (508kB) |
Nitrile-NBR | 80 | with medium percentage of Acrylonitrile | FDA 177.2600 ADI, EC1935/2004 |
black | -30 / +120 |
| NBR 47702 (475kB) |
Nitrile-NBR | 90 | with medium percentage of Acrylonitrile. Standard compound with good compression set values for contact with hydraulic fluids | black | -30 / +120 | |
| NBR 366490 (508kB) |
Nitrile-NBR | 90 | with medium percentage of Acrylonitrile | FDA 177.2600 ADI, EC1935/2004 |
black | -30 / +120 |
| NBR 366303 (475kB) | NBR | 90 | Ideal for Vulc-O-ring | black | -20 / +120 |