Nipol ® NBR Elastomers
Nipol NBR elastomers are made by emulsion polymerization of 1,3-butadiene and acrylonitrile. The polar acrylonitrile provides the useful contribution for product applications requiring oil and gasoline resistance, abrasion resistance, gas permeability and thermal stability. Higher acrylonitrile content provides improved solvent, oil and abrasion resistance, along with higher Tg, while a lower acrylonitrile content improves compression set, low-temperature flexibility and resilience.
The other primary criterion is Mooney Viscosity, a measure of approximate molecular weight, or toughness. As Mooney Viscosity increases, the ultimate physical properties and compression set are improved while oil/fuel resistance, abrasion resistance and heat resistance are slightly improved. A lower Mooney Viscosity improves processability.