FKM 3 - Fluoroelastomer terpolymer containing fluorinated vinyl ether

Clwyd referenceFKM 3
ASTM classificationFKM 3

Terpolymer of tetrafluoroethylene (TFE), a fluorinated vinyl ether (PMVE), and vinylidene fluoride (VF2/VDF). The addition of PMVE provides better low temperature flexibility compared to copolymers and terpolymers. Typically the fluorine content of type 3 FKMs ranges from 62 to 68 weight percent.

Typical applications
Advantages
Disadvantages
Available hardness range (Shore A)60 - 95
Upper continuous service temp.250°C
Min. temp. for sealing applications-25°C
Minimum non-brittle  temp. -40°C
Tensile strength (up to)20 MPa
Elongation at break (up to)300%
Price BracketHigh
ASTM 1 OilExcellent
ASTM 2 OilExcellent
ASTM 3 OilExcellent
KeroseneExcellent
Liquid BExcellent
Liquid 101Excellent
Phosphate esterNone
KetoneAverage
TolueneExcellent
Iso-octaneExcellent
MethanolGood
Acid (weak)Excellent
Acid (strong)Average
Base (weak)None
Base (strong)None
Hydrogen sulphideNone
SteamAverage
OzoneExcellent
RadiationExcellent
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