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