NBR (nitrile) seals dominate hydraulic applications for cost-effective sealing in petroleum oils. With 30% acrylonitrile content, they offer excellent compression set resistance up to 100°C. Oilfield piston seals use NBR for general-duty cylinders. Limits include poor ozone and chemical resistance. Hardness 70-90 Shore A suits pressures to 400 bar. Low-temperature grades (-40°C) aid a... https://globalsealstech.com/hydraulic-seals/