NBR is the best non-polar medium in general-purpose rubber. Petroleum oil is the most commonly used, such as gasoline and kerosene. However, these oils are natural products. Although some oil indexes are in the qualified range, their components may not be the same and have different effects on rubber. Therefore, ASTM stipulates five standard oils (aniline points are equal volumes of oil and The lowest temperature at which anilines dissolve each other).

The Society of Automotive Engineers (SAE) classifies rubber materials (J200/ASTM D2000) and classifies rubber materials into different grades according to oil resistance and heat resistance. The abscissa on the graph indicates the oil resistance by the volume expansion ratio of ASTM No. 3 oil, and the ordinate indicates the heat resistance. They are divided into ten grades: A, B, C, D, E, F, G, H, J, and K. The higher the grade, the better the oil resistance or heat resistance. NBR’s oil resistance grade is about J grade, which is better. The heat resistance is only B grade. Compared with the cold resistance of several rubbers, NBR has better cold resistance than FPM and CO, but is worse than NR, EPDM and CR.