This standard BS EN 2843:2013 Aerospace series. Acrylonitrile-butadiene rubber (NBR). Mineral oil resistant. Hardness 80 IRHD is classified in these ICS categories:
49.025.40 Rubber and plastics
This European Standard specifies the properties of acrylonitrile-butadiene rubber (NBR) ), fuel and synthetic oil resistant, hardness 50 IRHD, for aerospace applications.