Nitrile

NBR, Buna-N, Acrylonitrile-Butadiene

-30°F to 245°F

1. Good oil and fuel resistance.
2. Good heat resistance up to 245°F in oil
3. High tensile strength.
4. Low swell in water.

1. Poor weather and ozone resistance.
2. Poor resistance against polar solvents
3. Poor resistance against chlorinated hydrocarbon and aromatic hydrocarbons

Silicone

VMQ, MQ, PMQ, FMQ

-70°F to 375°F

1. Only minor changes in physical characteristics at high or low temperatures
2. Excellent weather and ozone resistance

1. Poor abrasion/wear resistance
2. Poor tear and tensile strength
3. Poor resistance to aromatic hydrocarbons and oxidized mineral oils

Fluoroelastomer

FKM, Viton®

-15°F to 400°F

1. Good temperature resistance up to 400°F
2. Excellent resistance against oils, acids and fuels
3. Low gas permeability

1. High swell in polar solvents and ketones
2. Poor low temperature resistance

Ethylene Propylene Rubber

EPDM, EPM

-50°F to 300°F

1. Very good wear resistance
2. Excellent weather and ozone resistance

1. Poor resistance to mineral oils
2. Special lubricants may be necessary for seals made from EPDM

Polychloroprene

CR, Neoprene®

-50°F to 212°F

1. Good resistance to chemical
2. Very good aging, weathering and ozone resistance
3. Very good flame resistance

1. Poor set and creep properties
2. Incompatible with fuels

Polytetrafluorethylene

PTFE, Teflon®

-325°F to 500°F

1. Extremely low friction
2. Excellent electrical insulating properties
3. Excels past all other elastomers and thermoplastics in chemical resistance

1. Poor abrasions resistance
2. Does not have the ‘shape memory’ of an elastomeric material

Polyurethane

AU, EU

-20°F to 175°F

1. Excellent mechanical strength
2. High abrasion resistance
3. Good resistance to ozone, water, oils and greases

1. Poor resistance to polar solvents, acids, alkalis
2. Typically harder than elastomers, but more flexible than plastics