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