- The substitution of
fluorine for a hydrogen on a carbon-backbone macromolecule creates a
unique class of rubbers typically referred to as fluoroelastomers.
- FKM is the
designation for about 80% of fluorinated elastomers as defined in ASTM
elastomers are perfluoro elastomers (FFKM) and tetrafluoro
ethylene/propylene rubbers (FEPM).
- FKM, is the largest
category (80+%) of fluoroelastomer.
- All FKM designated
elastomers contain vinylidene fluoride (VF2), a disubstituted monomer.
- FKM is defined as
Fluoro rubber of the polymethylene type that utilizes vinylidene
fluoride as a comonomer and have substituent fluoro, alkyl,
perfluoroalkyl or perfluoroalkoxy groups in the polymer chain, with or
without a curesite monomer.
- Fluoroelastomers are
generally made in an emulsion polymerization process.
- Fluoro-monomers such
as HFP, VF2, and TFE are fed to a reactor under elevated temperature and
pressure along with surfactants and other additives.
- Once the
polymerization is complete the latex is removed, the polymer coagulated
and washed, and the polymer is dried and packaged for use.
hydrodehalogenation (THD) is a conversion technique where halons and
CFCs react with hydrogen or hydrogen donor molecules at high temperature
to form a mixture of hydrofluorocarbons (HFCs), hydrocarbons,
perfluorocarbons and mineral acids as products.
- Fluoropolymers are
designed for high demanding applications in hostile environments. They
represent a high level choice in applications where chemical environment
and high temperatures are the dominating factors.
elastomers (FKM) are routinely used as sealing devices for gas turbine
engines, auxiliary power units, air cycle machines, filters, integrated
drive generators, hydraulic servos and actuators.
- O-rings used in
fittings, connectors, valves, pumps, filters and oil reservoirs.
- Radial lip seals used
in pumps. T-seals used in high pressure fittings andconnectors
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