• A - Recommended - Little or minor effect
• B - Minor to moderate effect - Rubber parts probably still useful in many applications
• C- Moderate to severe effect - Rubber parts perhaps still useful in limited applications
• U - Not recommended
• Blank - No data or insufficient evidence - It should be noted that it is not expected that a polymer
  unrated would perform better than those that are rated.

NNR/IR - Natural Rubber; SBR/BR - Butadiene Styrene;
IIR - Butyl; EPM/EPDM - Ethylene Propylene;
NBR - Nitrile; CO/ECO - Epichlorohydrin;
CR - Neoprene; CSM - Hypalon; AU/EU - Urethane;
T - Polysulfide; Si - Silicone; FSi - Fluorosilicone;
FPM - Fluoro Elastomer; ACM - Poly Acrylate