PTFE Technical Details

Fluoropolymers have many advantages and strengths associated with non-stick, low friction and chemical resistance to name but a few. However, to make the right selection of a fluoropolymer that suits a particular application, we include additional technical information that illustrates the properties of the range of materials, both in general and comprehensive terms. . In addition, other reference documents can be found that highlight the benefits of the industrial fluoropolymer range.

Key attributes of PTFE Coatings:
Few solid substances will permanently stick to a PTFE coated finish, although some sticky materials may show signs of adhesion, almost all substances release easily.
Low Coefficient of Friction:
The coefficient of friction of PTFE is generally in the range of 0.05 top 0.20, this is dependent upon the load and dynamic speed.

Surfaces coated with PTFE are both oleophobic and hydrophobic , they are not readily wetted. Clean-up is easier and in some cases surfaces are self-cleaning.

Heat Resistance:
PTFE coatings can operate continuously up to 260°C.

Electrical Properties:
PTFE coatings have high dielectric strength, low dissipation factor and very high surface resistivity.

Cryogenic Stability:
PTFE coatings can withstand severe temperature extremes without loss of physical properties. PTFE coatings can be used low as -270°C /-454°F.

Chemical Resistance:
PTFE is normally unaffected by chemical environments, with the exceptions of molten alkali metals and highly reactive fluorinated agents.

Definitions of Resins - Fluoropolymer
Fluoropolymers are known for their inertness to most chemicals, resistance to high temperatures, extremely low coefficients of friction and excellent dielectric properties which are relatively insensitive to temperature and power frequency. Typical applications for fluoropolymers are electrical/ electronic uses and pipe and chemical processing equipment and non-stick coatings for cookware and other applications. Fluoropolymers make up a family of thermoplastic resins analogous to polyethylene in which some of the hydrogen atoms attached to the carbon chain are replaced by fluorine or fluorinated alkyl groups. In some cases, other halogens such as chlorine are also part of the molecule.

 The most common commercial fluoropolymers are:
FEP (fluorinated ethylene-propylene) from tetrafluoroethylene [C2F4] and hexa-fluoropropylene [C3F6];

PTFE (polytetra fluoroethylene) from the polymerization of tetrafluoroethylene and ethylene [C2H4];

PFA (perfluoroalkoxy) from tetrafluoroethylene and perfluoropropyl vinyl ether [C3H7C4OF5];

PCTFE (polychlorotrifluoro-ethylene) from chlorotrifluoro-ethylene monomer [C2F3CI];

CTFE-VDF (polychlorotrifluoroethylenevinylidene fluoride) from chlorotrifluoroethylene and vinylidene fluoride [C2H2F2]; E-CTFE (polyethylenechlorotrifluoroethylene) from chlorotrifluoroethylene and ethylene;

PVDF (polyvinylidene fluoride) from vinylidene fluoride monomer; and PVF (polyvinyl fluoride) from vinyl fluoride monomer [C2H3F].

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