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Резина NBR

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

  • Wipers for special instance
  • Piston and road seals
  • Rotary seals
  • O-Rings

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