- Teflon® PTFE (polytetrafluoroethylene)
nonstick coatings are two-coat (primer/topcoat) systems. These products
have the highest operating temperature of any fluoropolymer
(260°C/500°F), an extremely low coefficient of friction, good
abrasion resistance, and good chemical resistance. PTFE is available
only in water-based liquid form.
FEP (fluorinated ethylene propylene copolymer) nonstick
coatings melt and flow during baking to provide nonporous films. These
coatings provide excellent chemical resistance. In addition to low
friction, FEP coatings have excellent nonstick properties. Maximum use
temperature is 204°C/400°F. FEP is available in water-based
liquid and powder forms.
PFA: Like FEP, PFA
(perfluoroalkoxy) nonstick coatings melt and flow during baking to
provide nonporous films. PFA offers the additional benefits of higher
continuous use temperature (260°C/500°F), film thicknesses up
to 1,000 micrometers (40 mils), and greater toughness than PTFE or FEP.
This combination of properties makes PFA an excellent choice for a wide
variety of uses, especially those involving chemical resistance. PFA is
available in both water-based liquid and powder forms.
- Teflon® ETFE is
a copolymer of ethylene and tetrafluoroethylene and is also sold under
the Tefzel® trademark. Although not fully fluorinated, ETFE has
excellent chemical resistance and can operate continuously at
149°C/300°F. This resin is the toughest of the fluoropolymers
and can be applied at film builds up to 1,000 micrometers (40 mils) to
provide a highly durable finish. ETFE is available in powder form.
One Coat: These solvent-based liquid
coatings are formulated with special blends of fluoropolymers and other
high-performance resins to improve toughness and abrasion resistance.
Because the film components stratify during baking, most of the
fluoropolymer properties (such as low friction and nonstick character)
are retained. The resins provide adhesion and abrasion resistance.
These products can sometimes be applied to smooth, clean metal. Bake
requirements vary, depending on the specific coating, from
163°C/325°F to 316°C/600°F.
- Teflon®-S Dry
Lubricant: Dry lubricant coatings are
special versions of Teflon®-S technology designed to provide
lubrication under high-pressure/velocity (PV) conditions. These
products are solvent-based, one-coat systems that are usually cured
between 260°C/500°F and 371°C/700°F.