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What is the difference between FEP and PFA

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What is the difference between FEP and PFA

  • Categories:Industry news
  • Author:Miss Teflon tube
  • Origin:Miss Teflon tube
  • Time of issue:2004-01-09 10:03
  • Views:

What is the difference between FEP and PFA

  • Categories:Industry news
  • Author:Miss Teflon tube
  • Origin:Miss Teflon tube
  • Time of issue:2004-01-09 10:03
  • Views:

  1. What is the difference between FEP and PFA

  First, we analyze the difference between FEP and PFA from the characteristics of the two products, FEP and PFA.

  FEP tube product features:

  ①FEP tube basically retains many characteristics of PTFE tube, such as insulation, anti-corrosion, lubrication and wear resistance, resistance to atmospheric aging, etc., high temperature resistance of 200 degrees.

  ②FEP pipe has low melt viscosity and excellent thermal stability.

  ③FEP tube is extrusion molding.

  ④The FEP tube is transparent.

  PFA tube product features:

  ① PFA has all the properties of PTFE, and the temperature resistance can also reach 260°C.

  ②The melt viscosity of PFA is lower than that of FEP, and it has excellent thermal stability.

  ③ PFA tube, PTFE and FEP are also extruded.

  ④ The PFA tube is transparent.

  In summary, there are two differences between FEP and PFA

  ①Different high temperature resistance, FEP high temperature resistance 200 degrees, PFA high temperature resistance 260 degrees

  ②The melt viscosity of FEP is slightly higher than that of PFA

  In addition to these functional differences, the other is that the raw materials produced will be different. The fluidity of PFA is stronger than that of FEP.




Figure 1: FEP tube source: Shenzhen Dankai


  ① Chemical resistance, non-adhesive liquid transfer equipment joints are not covered and protected

  ②Protection of sensor

  ③Non-adhesion of metal balls

  ④ Protective coating for medicines under high temperature

  ⑤The outer covering of the optical fiber sheath

  ⑥FEPG-D (electrical) is mainly used for insulating sheaths of optical fiber tubes and electrical components, wires and cables at various frequencies.

  ⑦FEPG-T (general purpose) is mainly used for explosion-proof, anti-corrosion and anti-sticking in places with harsh working conditions. Such as: corrosive liquid level gauge and corrosive gas and liquid conveying pipe, etc.

  Second, what industry is FEP pipe used for?

  (F-46) Polyperfluoroethylene propylene (F-46) is a fluoroplastic developed to overcome the shortcomings of poor processing and molding properties of PTFE. It is a copolymer of polytetrafluoroethylene and polyhexafluoropropylene (F-6). Polytetrafluoroethylene propylene is a synthetic polymer material that uses fluorine to replace all hydrogen atoms in polyethylene. The more famous application of PTFE is the outer wall material of the Water Cube, which is the largest concentrated use in the world.

  Except for the use temperature slightly lower than PTFE, almost all its excellent properties are maintained. Polyperfluoroethylene propylene has relatively high thermal fluidity and can be made of general thermoplastics.

  Processing and molding methods, such as molding, extrusion, injection molding, etc., can also be made into anti-corrosion coatings. Therefore, it has been widely used in petrochemical anticorrosion projects.

  FEP tube color:

  Common colors: transparent, black;

  Unusual colors: yellow, brown, green, blue




Picture 2: Other color FEP tube source: Shenzhen Dankai

  3. Can the FEP tube take hydrogen peroxide?

  The molecular structure of FEP is the same as that of polytetrafluoroethylene. It is also a fully fluorinated structure. The difference is that part of the fluorine atoms in the main chain of F46 are replaced by trifluoromethyl (-CF3).

  Chemically: it is stable to almost all chemicals and solvents

  Thermally: The continuous use temperature of PTFE and PFA is 260 degrees, and the continuous use temperature of FEP is 200 degrees.

  Mechanically: the smallest coefficient of friction and tightness

  Electrical: In the insulator, it has a smaller dielectric constant and dielectric loss factor

  Others: non-adhesive, weather resistance, flame resistance, low temperature resistance

  Time of invention: PTFE -> FEP -> PFA

  Hydrogen peroxide, the chemical formula H2O2. Pure hydrogen peroxide is a light blue viscous liquid that can be miscible with water in any proportion. It is a strong oxidant. Its aqueous solution is commonly known as hydrogen peroxide and is a colorless and transparent liquid. Its aqueous solution is suitable for medical wound disinfection, environmental disinfection and food disinfection. Under normal circumstances, it will slowly decompose into water and oxygen, but the decomposition rate is extremely slow. The way to speed up the reaction is to add a catalyst-manganese dioxide, etc. or irradiate it with shortwave rays.

  Can the FEP tube take hydrogen peroxide? The answer is no problem at all. FEP has stability to almost all chemicals and solvents, corrosion resistance, acid and alkali resistance, and friction resistance. The oxidation and corrosion effects of hydrogen peroxide are extremely small compared to other chemicals and solvents. Therefore, friends in need can safely use the FEP tube to take the hydrogen peroxide.

  Shenzhen DanKai Technology Co., Ltd. (ShenZhen DanKai Technology Co.,ltd.), whose predecessor is Dongguan Dandi Insulation Material Co., Ltd. Fluoroplastic Material Factory, established in 1998, specializes in FEP, PFA, PTFE and other fluoroplastic pipes R&D, production and sales of rod, sheet and film products and other insulating materials. The company has a senior R&D team with international standards and a production line of fluorine plastic products imported from abroad. Some fluoroplastic products have passed ISO9001, SGS, FDA certification, and have been fully affirmed by domestic and foreign cooperative customers such as Huawei, Foxconn, Midea, ZTE, Intel, and AirTAC. The main products of the company are: ①Tubes: Ptfe tube, Fep tube, Pfa tube, Pvdf tube; ②Heat shrinkable tube: Ptfe heat shrinkable tube, Fep heat shrinkable tube, Pfa heat shrinkable tube, Pvdf heat shrinkable tube; ③Plate rod Membrane: Ptfe board and rod film, Fep board and rod film, Pfa board and rod film, Pvdf board and rod film; ④Insulation materials: silica gel, PE, PVC, UPE, etc.; ⑤Special category: PFA imported connector, spiral tube, spring tube , Rotary cut tube, welding rod, tee, straight-through, gasket, joint, taper rod, flared tube, sealing tube, braided tube, bellows, etc. At the same time, fluorine plastic products of various specifications can be customized and processed according to customer requirements.

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