NBR: Acrylonitrile-butadiene rubber
- Short Name
- NBR
- Name
- Acrylonitrile-butadiene rubber
- Group
- EM - Elastomers
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- -44 to 5 °C
- Melting Temperature
- - °C
- Melting Enthalpy
- - J/g
- Decomposition Temperature
- 450 to 475 °C
- Young's Modulus
- 2 to 5 MPa
- Coefficient of Linear Thermal Expansion
- 150 to 180 *10¯6/K
- Specific Heat Capacity
- 1.93 to 1.96 J/(g*K)
- Thermal Conductivity
- - W/(m*K)
- Density
- 1.00 g/cm³
- Morphology
- Amorphous rubber
- General properties
- Good abrasion resistance. Good temperature resistance. Very good resistance to fuels, mineral oils, lubricating greases, vegetable and animal fats and oils
- Processing
- Cross-linking by means of sulfur (with accelerator)
- Applications
- Apparatus engineering (e.g., seals, O-rings). Automobile industry (e.g., brake pads, clutches). Packaging industry. Rubber gloves
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 11.47 mg
- Isothermal Phase
- 7 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
In this case, NBR has a slightly lower glass transition temperature (-29°C, midpoint, 2nd heating, green) and a slightly lower Δcp (0.29 J/(g.K)) than in the HNBR (Tg -23°C, Δcp 0.38 J/(g.K)) example on the previous pages.
Also the step height is a bit lower and is overlapped by a slight relaxation.
Also the step height is a bit lower and is overlapped by a slight relaxation.