Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Technologies
- Product Families
Features & Benefits
- Product Background
Acrylonitrile butadiene rubber (NBR), usually shortened to nitrile or NBR, was developed in 1941 as the first oil resistant rubber. NBR rubber grades with high acrylonitrile content have better oil resistance, whereas low acrylonitrile content gives better low-temperature flexibility and resilience.
-
Advantages of NBR
- NBR has moderate physical properties but good abrasion resistance. It is extremely versatile, reliable and offers reasonable resistance to petroleum oil, crude oil, water, gasoline and some hydraulic fluids. Offering great abrasion and compression set resistance, NBR is a cost-effective sealing solution. Because of this, NBR is a popular sealing material for a wide range of applications.
-
Disadvantages of NBR
- Some disadvantages of NBR include high gas permeability. NBR’s ozone resistance and electrical properties are also poor. NBR is not suitable for use with polar solvents and its poor flame resistance can be a disadvantage. Certain grades of nitrile rubber can be compounded with PVC to improve aging, flame, petrol and ozone resistance which combats some of the disadvantages listed above. Indeed, carboxylated grades of nitrile rubber (XNBR) have enhanced physical properties and higher temperature resistance.
-
Applications & Uses
- Applications
- Plastics & Elastomers End Uses
- Typical Applications
- Accumulator bladders
- Diaphragms
- Gaskets
- Hose
- Liners
- O-Rings
- Seals
Properties
- Color
- Typical Properties
- Note
* - Volume change (%) after immersion in Liquid B, 24 hours at 40°C
** - Temperature in °C at which the stiffness shall not exceed 70 MPa
*** - Resistance to Accelerated Air Aging, 168 hours at 70°C (Test Method - BS 903 A19)
| Value | Units | Test Method / Conditions | |
| Density | 1.24 - 1.28 | g/cm³ | ISO 2781 |
| Hardness | 76 - 85 | IRHD | ISO 48 |
| Tensile Strength | min. 12.5 | MPa | ISO 37 |
| Elongation at Break | min. 150 | % | ISO 37 |
| Compression Set (24 hours at 70°C) | max. 20 | % | ISO 815 |
| Resistance to Liquids* | 0 - 25 | % | BS 903 A16 |
| Resistance to Low Temperature | -15.0 | °C | BS 903 A19 |
| Change in Hardness*** | 0 - 10 | IRHD | ISO 48 |
| Change in Tensile Strength*** | max. -10 | % | ISO 37 |
| Elongation at Break*** | max. -35 | % | ISO 37 |