Perfluoroelastomer FFKM-全氟醚橡胶
Perfluoroelastomer (FFKM)
The name “perfluoroelastomer” is somewhat misleading.
An actual perfluorinated material with a high molecular
weight is polytetrafluoroethylene or PTFE which has the
chemical formula “(CF2)n.” The molecular carbon chain is
shielded by the chemical inertness of the large bonded
fluorine atoms. Perfluoroelastomer is produced by the
copolymerization of tetrafluoroethylene (TFE) and a
perfluorinated ether, e.g. perfluoromethylvinylether
(PMVE).
The differing resistance to volume swell of the different
perfluoroelastomers is due to the perfluorinated ether element,
where the side-chain can consist of up to four
perfluorinated carbon atoms. The extraordinary chemical
resistance is partly due to the fluorine atoms shielding the
carbon chain, and partially due to the vulcanization system.
Parker Seal, in cooperation with a leading polymer manufacturer,
has developed several such perfluorinated elastomer
materials.
Parker ParofluorTM materials are being developed and manufactured
in-house at Parker. In contrast to other
perfluoroelastomer suppliers, where a polymer manufacturer
will either produce and deliver the ready mixed
compound or even supply the final vulcanized part, Parker
will compound with the raw polymer and then manufacture
the desired component. This allows the specific material
properties to be jointly developed with the customer.
Heat resistance
• 232°C to 300°C (450°F to 590°F) depending on compound.
Cold flexibility
• -18°C to -26°C (0°F to -15°F).
Chemical resistance
• Aliphatic and aromatic hydrocarbons.
• Chlorinated hydrocarbons.
• Polar solvents (acetone, methylethylketone,
ethylacetate, diethylether and dioxane).
• Inorganic and organic acids.
• Water and steam.
• High vacuum with minimal loss in weight.
Not compatible with:
• Fluorinated refrigerants (R11, 12, 13, 113, 114, etc.)
