Elastomer

Rating

Natural Rubber, Isoprene

2

Butadiene Styrene, Butadiene

2

Butyl

2

Ethylene Propylene

1

Nitrile

3

HNBR

2

Epichlorohydrin

4

Polychloroprene

4

Chlorosulfonated Polyethylene

3

Chlorinated Polyethylene

1

Urethane

4

Polyacrylate

4

Polysulfide

2

Silicone

2

Ethylene acrylic elastomers

4

Fluorosilicone

4

Tetrafluoroethylene/Propylene

---

Fluoroelastomer - Dipolymer

3

Fluoroelastomer - Terpolymer

3

Perfluoroelastomer

1