Acrylonitrile butadiene rubber (NBR), also called nitrile rubber
Registered trade name: Perbunan (formerly Buna N)
The copolymerisation of acrylonitrile and butadiene gives NBR exceptionally good resistance to mineral oil and fuel, as well as a low compression set. It is therefore the ideal sealing material for the media mentioned. NBR has its main areas of application where, in addition to good properties, high swelling resistance to mineral oils and fuels as well as resistance to ageing, heat and abrasion are required. The main applications are seals, hoses and diaphragms.
| Hardness | 40 to 90 Shore A |
| Elongation at break | 100 to 700% and higher |
| Maximum temperature | +100° C |
| Minimum temperature | -20°C |
| Electrical properties | not suitable for electrical insulation, as NBR is to be regarded as a semiconductor |
| Gas permeability | lower than NR, SBR, EPDM but higher than IIR |
| Ageing and ozone resistance | Ageing better than NR and SBR, ozone resistance lower than NR |
| Chemical resistance | Very good against grease and mineral oil |
Nitrile rubber is used for oil and fuel-resistant seals, moulded parts, diaphragms and hoses in motor vehicles and mechanical engineering. Further applications are roller covers, gas and air conditioning hoses, according to its good oil and grease resistance. Pneumatic and hydraulic seals can be made from this rubber as well as O-rings and radial shaft seals.
