Teflon® Coating
The 6 basic Types of Teflon Coating
DuPont Teflon® industrial coatings can be used on carbon steel, aluminum, stainless steel, steel alloys and brass, as well as some non-metallics in certain circumstances. Optimum adhesion is obtained by roughening the surface before applying the coating. The substrate must be able to withstand grit blasting and baking at temperatures of 200 to 400°C depending on the coating applied. Except where specifically mentioned, most Teflon® industrial coatings require a primer coat.
| 1. PTFE PTFE (polytetrafluoroethylene) nonstick coatings are two-coat (primer/topcoat) systems. These products have the highest operating temperature of any fluoropolymer (260°C), an extremely low coefficient of friction, good abrasion resistance, and good chemical resistance. PTFE is available only in water-based liquid form. |
Applications Heat exchangers Automatic soldering equipment Molds Carburetor shafts, linkages Cruise control parts Filters Cryogenic applications Aerospace applications. |
| 2. FEP 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. FEP is available in water-based liquid and powder forms. |
Applications Chemical equipment (impellers, mixing tanks, valves, pumps) Biomedical equipment Heat sealing bars Shoe molds Textile dryers |
| 3. Teflon®-S 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 to 316°C. 3. 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 and 371°C. |
Applications Automotive gasoline filler tubes Sprinkler ball valves Fan blades, housings, garden tools Automotive fasteners CPI fasteners Boat propellers Saw blades Packaging equipment, conveyors Fuel injectors, saw blades. |
| 4. Teflon® One Coats Self-Priming ONE-COAT blends of fluoropolymer with other resins. Usually cured between 345°C and 400°C. |
Applications Coffee plate warmers Assorted food-processing utensils Iron sole plates Sandwich makers |
| 5. 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), film thicknesses up to 500 micrometers, 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. |
Applications Chemical equipment (impellers, mixing tanks, valves, pumps) Biomedical equipment Silicone wafer mfg Equipment Molds Laundry dryers Copier, printer rolls Paint spray cups Light bulbs |
| 6. ETFE 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. This resin is the toughest of the fluoropolymers and can be applied at film builds up to 1,000 micrometers to provide a highly durable finish. ETFE is available in powder form. |
Applications Chemical equipment (centrifuges, tank linings, valves, pumps, exhaust ducts) Polystyrene molds. |
Flash version