Elastomer	Rating
Natural Rubber, Isoprene	3
Butadiene Styrene, Butadiene	2
Butyl	2
Ethylene Propylene	2
Nitrile	2
HNBR	2
Epichlorohydrin	---
Polychloroprene	4
Chlorosulfonated Polyethylene	4
Chlorinated Polyethylene	---
Urethane	4
Polyacrylate	4
Polysulfide	---
Silicone	---
Ethylene acrylic elastomers	4
Fluorosilicone	4
Tetrafluoroethylene/Propylene	---
Fluoroelastomer - Dipolymer	4
Fluoroelastomer - Terpolymer	3
Perfluoroelastomer	1