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Which PTFE and FEP tube should be selected

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Which PTFE and FEP tube should be selected

  • Categories:Industry news
  • Author:PFA tube lady
  • Origin:PFA tube lady
  • Time of issue:2010-08-04 15:23
  • Views:

Which PTFE and FEP tube should be selected

  • Categories:Industry news
  • Author:PFA tube lady
  • Origin:PFA tube lady
  • Time of issue:2010-08-04 15:23
  • Views:

  1. Which PTFE and FEP tube should be selected?

  Which PTFE or FEP to choose depends on the user's needs. The commonly used color of PTFE is milky white, followed by translucent and colored. Transparent has not yet been invented. While FEP replaces the disadvantages of PTFE, the commonly used color of FEP is transparent.

  In addition to the color substitution, their temperature resistance is slightly different. PTFE can withstand high temperature of 260 degrees, and FEP can withstand high temperature of 200 degrees. If you need a transparent tube, with a high temperature resistance of 260 degrees, you can use PFA instead.

  Next, I will introduce the difference between PTFE and FEP.

  Polytetrafluoroethylene (Poly tetra fluoroethylene, abbreviated as PTFE), is generally called "non-stick coating" or "easy to clean material". This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance, and its friction coefficient is extremely low, so it can be used for lubrication and become an ideal coating for easy cleaning of the inner layer of water pipes.

  The mechanical properties of PTFE are relatively soft. Has a very low surface energy. PTFE has a series of excellent performance:

  High temperature resistance: long-term use temperature 200~260 degrees;

  Low temperature resistance: still soft at -100 degrees;

  Corrosion resistance: resistant to aqua regia and all organic solvents;

  Weather resistance: better aging life in plastics;

  High lubrication: has the smaller coefficient of friction in plastics (0.04);

  Non-sticky: It has a small surface tension in solid materials without adhering to any substances;

  Non-toxic: physiologically inert; excellent electrical properties, is an ideal C-level insulating material, a thick layer of newspaper can block the high voltage of 1500V; smoother than ice

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Picture left: PTFE tube Picture right: FEP tube Source: Shenzhen Dankai

  The friction coefficient of PTFE is extremely small, only 1/5 of polyethylene, which is an important feature of perfluorocarbon surface. In addition, because the fluorine-carbon chain intermolecular forces are extremely low, PTFE is non-sticky. Polytetrafluoroethylene maintains excellent mechanical properties in a wide temperature range of -196 to 260°C. One of the characteristics of perfluorocarbon polymers is that they are not brittle at low temperatures. PTFE has a high density, 2.14-2.20g/cm, almost no water absorption, and the equilibrium water absorption rate is less than 0.01%. Polytetrafluoroethylene is a typical soft and weak polymer. The mutual attraction between macromolecules is small, rigidity, hardness, and strength are small, and it will deform under long-term stress.

  Features of FP structure of polyperfluoroethylene propylene pass material:

  Polyperchloroethylene propylene FEP is a copolymer of two monomers of tetraoxyethylene and hexafluoropropylene. The abbreviation code is FEP. Polyperfluoroethylene propylene FEP is a linear polymer. The molecular chain can be regarded as the main polytetrafluoroethylene. As a result of the replacement of one fluorine atom attached to every four carbon atoms in the chain by a CF3 group, the symmetry and regularity of the FEP molecular chain are broken compared with polytetrafluoroethylene, which reduces the rigidity of the molecular chain and increases the flexibility. , The melting point of the material will decrease, the fluidity will increase, and the heat resistance will also be lower.

  The destruction of FEP regularity affects the crystallinity of the material, and the crystallinity will be reduced. The FEP molecular chain still does not show polarity. Polyperfluoroethylene propylene is a milky white translucent to transparent body, with a density of 2.14–2.179/cm3, the second-generation polytetrafluoroethylene, the surface is as smooth as wax, and the water absorption rate does not exceed 0.01%.

  2. Teflon capillary manufacturers

  Teflon capillary tube is a special tube made of polytetrafluoroethylene (ptee, commonly known as Teflon, plastic king) material after extrusion and sintering, drying, high temperature sintering, and shaping. Because the tube is about the same size as a blood vessel, it is also called Teflon capillary.

  At present, Teflon capillary tubes are widely used in important technology industries such as machinery, electronic appliances, automobiles, aerospace, chemicals, computers, electric heating, military, and communications, such as miniature transformers.

  Teflon capillary has a high degree of chemical stability: it can withstand all strong acids, including aqua regia, hydrofluoric acid, concentrated hydrochloric acid, nitric acid, fuming sulfuric acid, organic acids, etc., strong alkalis, strong oxidants, reducing agents and various organic The role of solvents. It is very suitable for feeding high-purity chemicals.

  Teflon capillary features:

  Has a low coefficient of friction: The coefficient of friction is generally only 0.04, which is a very excellent self-lubricating material, and the coefficient of friction does not change with changes in temperature.

  

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Figure 2: Teflon capillary source: Shenzhen Dankai

  Excellent adhesion resistance, the inner wall of the tube is not easy to adhere to colloids and chemicals. ※Excellent aging resistance, can be used outdoors for a long time.

  Excellent electrical insulation properties of Teflon capillaries: ptfe is a highly non-polar material with good dielectric properties, great resistance, and a dielectric constant of about 2.0, which is small among all electrical insulation materials.

  Part of the Teflon capillary tube has high transparency, and the internal fluid condition can be easily observed.

  Teflon capillary parameters

  1. Withstand voltage: 150v-600v

  2. Working temperature: -80 ℃ ~260 ℃

  3. Melting point: 327 ℃

  4. Flame retardancy: vw-1

  5. Breakdown strength: 26kv/mm

  6. Color: transparent, colorful

  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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