What’s the difference between PFA, FEP, ETFE, ECTFE, PTFE?

ECTFE (Halat), ETFE (Teflon), FEP (Teflon), PFA (Teflon) and modified PTFE, like partially fluorinated or perfluorinated polymer materials, can be processed by thermoplastic molding methods. They are effective for almost all organic And inorganic compounds, whether acidic or alkaline, have high tolerance. These materials show universal and durable resistance to acids, alkaline solvents and chlorides. A type of thermoplastic resin containing fluorine atoms in its molecular structure. It also shows excellent resistance to mechanical damage in terms of wear resistance, impact resistance and toughness.

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

1. PTFE
●Maximum operating temperature is 300℃.
●Continuous use temperature of 260℃.
●The sintering temperature used for PTFE coating is 380~420℃.
●Very low coefficient of friction, good wear resistance and excellent chemical stability.
●The spraying thickness of PTFE is about 50um (liquid). PTFE has no powder coating, but powder is used for the lining. The thickness of the lining ranges from 2mm to 5mm. The anti-corrosion thickness is based on customer requirements. The liquid is used for anti-sticking and wear resistance. There are several colors.
●Corrosion resistance: PTFE is hardly corroded by chemicals and can protect the product from any kind of chemical corrosion.
●PTFE can only be used for lining in anti-corrosion, not suitable for coating.

2. PFA
●The highest operating temperature is 290℃.
●Continuous use temperature of 260℃.
●The sintering temperature used for PFA coating is 380℃.
●With higher continuous use temperature and stronger hardness, it is especially suitable for anti-sticking and chemical resistance applications under high temperature conditions.
●The spraying thickness of PFA is 100um (liquid), which is mainly used for anti-sticking and high temperature resistance. The spraying thickness of PFA electrostatic powder can range from 0.2mm to 1.0mm. Generally, primers are required and cannot be used alone. The color is black, brown, and primer. It is liquid, the surface layer is powder, the liquid should be air spray gun, and the powder should be electrostatic powder spray gun.
●Corrosion resistance: PFA is hardly corroded by chemicals and can protect the product from any kind of chemical corrosion.

3. FEP
●Maximum operating temperature is 230℃.
●The continuous use temperature is 200℃.
●The sintering temperature used for FEP coating is 360℃.
●FEP coating is the toughest fluoropolymer. It can form a highly durable coating with excellent chemical resistance and can work continuously at 200°C.
●FEP spraying thickness is 50um (liquid), mainly used for anti-sticking, (normal use below 200℃) PFA electrostatic powder spraying thickness can range from 0.2mm to 1.0mm, generally matching primer, can not be used alone, the color is black and green , The primer is liquid, the surface layer is powder, air spray gun is used for liquid, electrostatic powder spray gun is used for powder.
●Corrosion resistance: FEP is hardly corroded by chemicals and can protect the product from any kind of chemical corrosion.

4. ETFE
●The highest operating temperature is 200℃.
●The continuous use temperature is 150℃.
●The sintering temperature used for ETFE coating is 280-320℃.
●ETFE can form a highly durable coating with excellent chemical resistance and can work continuously at 150°C.
●The spraying thickness of ETFE can range from 0.2mm to 1.8mm, divided into primer and topcoat.
●ETFE powder coating as a corrosion-resistant protective coating is widely used in the chemical industry, paper industry, pharmaceutical industry, food industry and semiconductor industry.

5. ECTFE
●The highest operating temperature is 200℃.
●The continuous use temperature is 150℃.
●The sintering temperature used for ECTFE coating is 270-290℃.
●This resin is the toughest fluoropolymer, can form a highly durable coating, and can work continuously at 150°C.
●Excellent surface smoothness and chemical resistance of ECTFE coating.
●The spraying thickness of ECTFE can range from 0.2mm to 1.5mm, divided into primer and topcoat.
●Usually ECTFE powder coating is applied on the surface of stainless steel and carbon steel, of course, it has been successfully applied on the surface of other metals (copper, aluminum, titanium) and ceramics.

Advantages of Teflon

Non-toxic, high purity, clean
No matter what kind of Teflon can provide an extremely smooth coating surface, it is difficult for microorganisms to get a foothold on it, and it can also be seamless in the case of no flange connection, avoiding cross-contamination, and has a high degree of cleanliness.
Teflon also has chemical resistance, low fluoride precipitation and fast cleaning performance for the full pH range, which fully meets the strict requirements of cleanliness, non-toxicity and high purity. These features allow Teflon to be used in the high-standard chemical industry, such as ultrapure water containers, polishing mixed beds, filter containers, storage tanks, deionizers, and other containers and storage tanks for semiconductor production.

Does not adhere to any substance
Teflon has the smallest surface tension among solid materials and hardly adheres to anything.

Resistant to high and low temperature -196℃ to 260℃
Teflon can be used for a long time between -196℃~260℃, which means that Teflon can not only be used to store liquid nitrogen, the coldest substance in the world, but also can withstand relatively high heat for a long time. widely.

Excellent wear resistance and lubricity
The friction coefficient of PTFE is extremely small, and it is smoother than ice. After the self-lubricating parts of the automobile industry, the piston of the air-conditioning compressor, the rollers of the copier and the rotating rollers of the paper industry and the industry, Teflon can save energy, reduce intoxicating noise, and improve efficiency, while ensuring Service life.

Excellent electrical properties
With excellent insulation resistance, a thick layer of newspaper can block the high voltage of 1500V.

Excellent chemical resistance
Teflon has a high degree of chemical stability. It can withstand all strong acids (including aqua regia, hydrofluoric acid, concentrated hydrochloric acid, and nitric acid) except for molten alkali metals, elemental fluorine and strong fluorinated media, and sodium hydroxide above 300°C. , Fuming sulfuric acid, organic acids, etc.), strong alkalis, strong oxidants, reducing agents and various organic solvents.

Therefore, reactors, centrifuges, mixing equipment, screening equipment, drying equipment, filtration equipment, pipelines, printing machinery, gluing machinery, food machinery, packaging machinery, textile industry rollers, medical equipment, molds, semiconductors and other industries are all in need This material.

Non-wetting
Teflon material makes the coating film denser with its unique additives, and can be used in medical and chemical agitators and stirring shafts. And combined with the characteristics of lubrication, moisture resistance and strong binding force, it can also be used to seal valves and lock cylinders.

Anti-penetration
The permeation resistance of the coating material has an important influence on the long-term performance of the coating. Even if the coating material itself is not corroded by chemicals, once a period of time passes, the chemicals penetrate into the coating and contact the metal substrate, which can corrode the metal and fail the protective effect of the coating.
Teflon has good resistance to permeation to oxygen, fluorine, water vapor, carbon dioxide, chlorine, hydrochloric acid and other gases. This also makes it widely used in chemical corrosion protection and semiconductor industries.

Strong flame retardancy
It is well known that fluoropolymers combine chemical resistance, inertness, low extractability and inherent and fire-resistant properties. As a result, fluoroplastics are rapidly being used in various tools and equipment in semiconductor processing, especially where strict fire safety standards are required. Teflon’s unique combination of chemical resistance, cleanliness and fire safety is the only possible solution for many applications. For example, ECTFE is included in the FM clean room.

Anti-aging, long life
Teflon not only maintains stability at low and high temperature scales, but also maintains its performance in harsh environments. It is not attacked by microorganisms even in a humid state. It has excellent aging resistance, which reduces the value of Maintenance costs.

Whether it is industrial needs or practical value, Teflon is perfectly qualified for the anti-corrosion requirements of the chemical industry, and under this ultra-high performance, the price of Teflon makes people feel worthwhile.