Knowledge Sharing | Performance characteristics of PTFE, PFA, FEP, ETFE, ECTFE coating materials

Corrosion is a widespread phenomenon in industrial production processes and has a great impact on the service life and measurement reliability of instruments. As the chemical and petroleum industries demand more and more measurement and control technology for automation instruments, it has become a common practice to add anti-corrosion coatings to the measuring instruments to ensure their service life and reliability.

ECTFE (Halat), ETFE (Teflon), FEP (Teflon), PFA (Teflon), and modified PTFE can be processed by thermoplastic molding methods, as can partially fluorinated or perfluorinated polymers, and they are highly resistant to almost all organic and inorganic compounds, whether acidic or alkaline.

These materials show a generally long-lasting resistance to acids, alkaline solvents and chlorinated substances. A class of thermoplastic resins that contain fluorine atoms in their molecular structure. They also show excellent qualities of resistance to mechanical damage in terms of abrasion resistance, impact resistance and toughness.

The performance characteristics of various coating materials are summarized as follows.

1. PTFE

The maximum operating temperature is 300°C.

● Continuous use temperature is 260°C.

The sintering temperature for PTFE coating is between 380 and 420°C.

● Extremely low coefficient of friction, good wear resistance, and excellent chemical stability.

● PTFE has a coating thickness of about 50um (liquid). PTFE does not have powder coating, but powder is available for lining. The general lining thickness is between 2mm and 5mm, and the anti-corrosion thickness can be customized according to customer requirements. There are more color choices.

● Corrosion resistance: PTFE is almost impervious to pharmaceuticals and can protect products from any kind of chemical corrosion.

PTFE can only be used as a lining in anticorrosion applications, not as a coating.

2. PFA

● The maximum operating temperature is 290℃.

● Continuous use temperature is 260℃.

● The sintering temperature for PFA coating is 380℃.

● With higher continuous use temperature and stronger hardness, it is especially suitable for use in the field of anti-adhesive and chemical resistance use under high temperature conditions.

● The coating thickness of PFA is 100um(liquid), mainly used in the case of anti-adhesive and high temperature resistance. the thickness of PFA electrostatic powder coating can be sprayed from 0.2mm to 1.0mm range, but generally it should be matched with primer and cannot be used alone. Its color is black, coffee, primer is liquid, the surface layer is powder, liquid to use air spray gun, powder to use electrostatic powder spray gun.

● Corrosion resistance: PFA is almost impervious to pharmaceuticals and can protect products from any kind of chemical corrosion.

3. FEP

● The maximum use temperature is 230℃.

● Continuous use temperature is 200℃.

● The sintering temperature used for FEP coating is at 360°C.

● FEP coating is the toughest fluoropolymer that forms a highly durable coating with excellent chemical resistance and can work continuously at 200°C.

● FEP has a coating thickness of 50um (liquid) and is mainly used in the case of anti-adhesive (normal use below 200°C.) PFA electrostatic powder coating thickness can be sprayed from 0.2mm to 1.0mm range, and it generally also needs a matching primer and cannot be used alone. Its color black green, primer is liquid, the surface layer is powder, liquid to use air spray gun, powder to use electrostatic powder spray gun.

● Corrosion resistance: FEP is almost impervious to pharmaceuticals and can protect products from any kind of chemical corrosion.

4. ETFE

● The maximum use temperature is 200℃.

● Continuous use temperature is 150℃.

● The sintering temperature used for ETFE coating is between 280 and 320°C.

● ETFE forms a highly durable coating with excellent chemical resistance and can operate continuously at 150°C.

● ETFE can be sprayed in thicknesses ranging from 0.2mm to 1.8mm, in primer and topcoat.

● ETFE powder coatings are widely used in the chemical industry, paper industry, pharmaceutical industry, food industry and semiconductor industry as corrosion resistant protective coatings.

5. ECTFE

● The maximum operating temperature is 200℃.

● Continuous use temperature is 150°C.

● The sintering temperature used for ECTFE coating is between 270 and 290°C.

● The resin is the toughest fluoropolymer that forms a highly durable coating and can operate continuously at 150°C.

● ECTFE coating has excellent surface smoothness and chemical resistance.

● ECTFE can be sprayed in a range of thicknesses from 0.2mm to 1.5mm in primer and topcoat.

● Usually, ECTFE powder coating is applied to stainless steel and carbon steel surfaces, but it has been successfully applied to other metals (copper, aluminum, titanium) and ceramic surfaces as well.