The medium generally refers to liquid substances such as oils, acids, alkalis, and reagents. If the rubber does not react with it, it does not dissolve.

Then the rubber is resistant to this medium. Because NR is non-polar, it is not resistant to non-polar oils such as gasoline and motor oil.

Transformer oil, diesel oil, etc.; not resistant to benzene, ring homes, Yixinyuan, etc. The raw rubber is dissolved in the above medium, and the vulcanized rubber swells.

NR polar medium, such as ethanol, acetone, water, etc.