Choosing the wrong elastomer leads to seal failure and chemical leaks. Each rubber has a distinct chemical profile: NBR for oils, EPDM for water, Viton for broad resistance, Silicone for temperature extremes.
A = Excellent B = Good C = Limited D = Not Recommended
Viton (FKM/FPM) has the broadest chemical resistance of any elastomer with 550 A-ratings, covering most acids, fuels, and solvents. However, it is attacked by ketones and amines.
What is the difference between NBR and EPDM?
NBR (Nitrile) excels with oils, fuels, and hydraulic fluids but fails with ozone and UV. EPDM excels with water, steam, and outdoor exposure but fails with petroleum products. They are essentially complementary materials.
