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Dupont Teflon® Coatings




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Dupont recognized the importance in the application procedure and expertise to engineer the appropriate coating system for their Teflon products to perform optimally. To accomplish this they created their Licensed Industrial Applicator (LIA) program that includes approximately 20 coaters nationally. Crest has the distinction of being an LIA for more than 40 years.

Because of our experience in applying Dupont Teflon® coatings, our skilled staff, and modern equipment, Crest has been a DuPont Licensed Industrial Applicator for more than 40 years. This is a source of pride for us, and a source of confidence for our customers.

The variety of Dupont Teflon® industrial coatings is extensive. For any particular use, there may be several Dupont Teflon® coatings that will perform well. Drawing on the experience of a Licensed Industrial Applicator ensures the best Dupont Teflon® coating for a given application, whether it be PTFE®, FEP®, PFA®, ETFE®, Dupont Teflon-S®, or others.

Crest's engineering and coating expertise is recognized nationwide. Customers from all parts of America routinely send components to us for coating.


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Specifications · Types of Dupont Teflon® Coatings

Specifications

Outstanding Properties of Dupont Teflon®

NONSTICK
Very few solid substances will permanently adhere to a Dupont Teflon® coated finish. Although tacky materials may show some adhesion, almost all substances release easily.

LOW COEFFICIENT OF FRICTION
The coefficient of friction of Dupont Teflon® is generally in the range of 0.05 to 0.20, depending on the load, sliding speed, and particular Dupont Teflon® coating used.

NONWETTING
Since surfaces coated with Dupont Teflon® are both oleophobic and hydrophobic, they are not readily wetted. Cleanup is easier and more thorough — in many cases, surfaces are self-cleaning.

HEAT RESISTANCE
Dupont Teflon® industrial coatings can operate continuously at temperatures up to 260°C/500°F and can be used for intermittent service up to 316°C/600°F with adequate ventilation.

UNIQUE ELECTRICAL PROPERTIES
Dupont Teflon® has high dielectric strength, low dissipation factor, and very high surface resistivity. By special techniques, it can even be made electroconductive enough to be used as an anti-static coating.

CRYOGENIC STABILITY
Many Dupont Teflon® industrial coatings withstand severe temperature extremes without loss of physical properties. Dupont Teflon® industrial coatings may used at temperatures as low as -270°C/-454°F.

CHEMICAL RESISTANCE
Dupont Teflon® is normally unaffected by chemical environments. The only chemicals known to affect all Dupont Teflon® industrial coatings are molten alkali metals and highly reactive fluorinating agents.

Applicable Surfaces

Aluminum
Brass
Carbon Steel
Fiberglass
Glass
Magnesium
Plastics
Rubber
Stainless Steel
Steel Alloys

Coefficient of Friction

0.05 to 0.20

Use Temperature Range

-270°C to 316°C
-454°F to 600°F

Pre-Treatment Process

Optimum adhesion is obtained by roughening the surface before applying the coating. Except where specifically mentioned, most Dupont Teflon® industrial coatings require a sandblast and primer coat.

Equipment List

See In-House Capabilities


Types of Dupont Teflon® Coatings

Dupont Teflon® PTFE

Polytetrafluoroethylene nonstick coatings are two-coat or three-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.

Dupont Teflon® 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.

Dupont Teflon® PFA

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.

Dupont Teflon® 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/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.

Dupont 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. Depending on the application, these materials may require sand blasting, etching or surface oxidation to obtain the desired results. Bake requirements vary, depending on the specific coating, from 163°C/325°F to 316°C/600°F.

Dupont Teflon-S® Dry Lubricant

Dry lubricant coatings are special versions of Dupont 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 148°C/300°F and 371°C/700°F.


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