Teflon® PTFE coatings have the lowest coefficient of friction and highest temperature resistance of any of the Teflon® coating systems. PTFE-based products can typically withstand temperatures of 550°F on a continuous basis and up to 600°F for brief periods. PTFE coatings are very good electrical insulators and are extremely non-wetting. They are inert to almost all chemicals, but are somewhat porous and thus permeable to water vapor and other gases. The substrate must be able to withsta
nd a cure temperature of at least 750°F to consider PTFE-based coating. Theoretical coverage at 1 mil (25 microns).
Benefits:
- One-coat or primer/topcoat system
- Excellent non-stick/low friction
- Very good chemical/corrosion resistance
- Good abrasion resistance
- Cure temperature 750°F
Teflon® FEP
FEP-based Teflon® coatings have superb release and are frequently used as mold release coatings. They melt flow to form a non-porous film and are thus more chemically resistant than PTFE coatings. FEP coatings have lower heat resistance than PTFE, but also cure at lower temperatures. FEP coatings are extremely non-wetting and have a very low coefficient of friction. Maximum use temperature is 400°F in an abrasive environment and 450°F in an unabrasive environment.
Benefits:
- Primer/topcoat coating system
- Excellent non-stick/low friction
- Excellent chemical/corrosion resistance
- Good abrasion resistance
- Cure temperature 650°F
Teflon® PFA
PFA - based coatings combine the high temperature resistance of PTFE coatings with the ability to achieve nonporous, chemical-resistant films like FEP. Films can be built to 40 mil (1000 microns) and ar equite tough and abrasion resistant. Release and coefficient of friction are very good.
Benefits:
- Excellent Chemical Resistance
- Non Porous Film
- Highest dielectric Strength = 3000 volts/mil
- Max use Temp 500°F
- Cure Temp 750°F
- Change build from 40 to 25
Teflon® S coatings are self priming, one coat products. They are formulated with organic binders to improve adhesion without the use of primers. They typically cure at lower temperatures than pure fluoropolymer dispersions. The fluoropolymer resin stratifies to the surface during the cure cycle, but because of the binder of resins, certain properties of the pure fluoropolymer may be 
compromised. These include temperature resistance and release.
Benefits:
- One-coat/solvent based coating system
- Excellent abrasion resistance
- Very good non-stick/low friction
- Good chemical corrosion resistance
- Cure temperature 350-630°F
Specialty Systems
Dupont has created a line of specialty systems that contain a patented combination of PTFE and PFA designed to offer durability and abrasion resistance with excellent release. Specialty Systems are available in a 2 coat, 3 coat Silverstone and 3 coat ceramic reinforced process. These combination coatings comply with FDA regulations in 21.CFR governing components of coatings for direct food contact. Maximum use temperature is 550°F (288C) continuous and 600°F (315C) intermittent.
Benefits:
- Long lasting release
- Excellent abrasion resistance
- Advanced cut resistance
- Excellent dialectic resistance
- Good chemical / corrosion resistance
The Kynar name is recognizable in the industry, but since Whitford purchased the Kynar 200 Series, it has been renamed Dykor 200. The primary market for this coating is equipment from the chemical processing industry. The 200 Series coatings are used to form a "polymer barrier." Being unaffected by most chemicals and solvents gives this coating unique properties.
Benefits:
High thermal stability
High dielectric strength
Excellent resistance to weathering, UV rays and nuclear radiation
Will not support combustion
Abrasion resistance
Thermal stability
Teflon® coatings may be applied to materials that can withstand the cure temperature of the coating. |
Typical Fluoropolymer Topcoat |
Cure Temperature |
PTFE |
700°F (370°C) |
FEP |
650°F (340°C) |
PFA |
700°F (370°C) |
Teflon® S |
350-650°F (175-340°C) |
Specialty Systems |
800°F (427°C) |
