1. Description: FEP is called Fluorinated ethylene propylene, translated as fluorinated ethylene propylene copolymer (perfluorinated ethylene propylene copolymer) English trade name: Teflon * FEP, is a kind of chemical substance. FEP is a copolymer of tetrafluoroethylene and hexafluoropropylene. The FEP crystals had a melting point of 304 ° C. and a density of 2.15g/cc.

FEP can be applied to soft plastics, the tensile strength, wear resistance, creep resistance is lower than many engineering plastics. It is chemically inert and has a low dielectric constant over a wide temperature and frequency range

2. feptube is what?

Polyfluoro ethylene propylene (F46, FEP) heat shrinkable tube.

2.1 performance, parameters

Volume resistance> 1018 Ωm, surface resistance> 1013Ω arc resistance> 165 seconds non-leakage low friction dynamic friction coefficient 0.2-0.3 non-stickiness, water, oil water contact angle θ = 114 о, non-combustible air will not burn (oxygen index> 95VOL%), shrinkage ratio is 1.7:1

2.2 Features

Temperature resistant, polytetrafluoroethylene F46, FEP heat shrinkable tube: -200-200 ℃

Meltable polytetrafluoroethylene (PFA) heat shrinkable tube: -200-250 ℃

Corrosion resistance only under high temperature element fluorine, alkali metal and its role, for all other concentrated, dilute inorganic organic acids, alkali, ester has no effect

2.3 application

Teflon FEP heat shrinkable tube has outstanding wear resistance, chemical corrosion resistance and high temperature performance, especially suitable for high temperature performance of the occasion, used to connect the weld insulation protection and pressure relief and distinction identification of covered components.

feb pipe extrusion molding feb pipe manufacturer

3. FEP tube extrusion molding

FEP processing and molding process: FEP tube manufacturer: Teflon tube little sister's home

FEP, like other meltable fluoroplastics, is hot-molded, die-cast, and extruded (vacuum and air pressure molding) using common methods. In standard equipment, all molded parts in contact with molten fluoroplastics shall be made of corrosion-resistant alloys. When processing meltable fluoroplastics should be heated to 400 ℃, in order to obtain the true melt and its homogenization in the processing unit should be specified plasticizing section. Highly toxic volatiles are evolved at high temperatures during FEP processing. Therefore, in all high temperature (>200 ℃) operation should start the exhaust fan.

3.1. Moulding (pressing)

Pressing a sheet with a thickness of 1~2mm can be made of two (upper and lower) nickel or chromium coated metal plates in a flat die or a limiter with a required thickness. In order to prevent adhesion with the metal surface, an aluminum foil liner with a thickness of 0.05~0.2mm can be added between the metal and the polymer. Place the press mold or limiter filled with polymer on the flat plate of the press heated to 290~310 ℃, keep it at this temperature for 25~30min, then press it under 20MPa pressure and keep it under this pressure for about 2 min, then stop heating and cool it to 240~250 ℃ under pressure (cold water can be used to cool the press plate), and loosen the pressure, the die or restrictor with polymer and metal plate was removed from the press, cooled in air to room temperature and the die was opened.

3.2. Extrusion molding

The extrusion method can be used to prepare films with a thickness of 0.01 to 0.2mm for wire and cable insulation, thin-walled pipes, plates, container products and fibers. In order to obtain a uniform melt and cause a large surface heat transfer of the extruder structure, the length to diameter ratio of the barrel should be 25~30: 1, and the barrel should have 3. to four independent heating sections, each heating section should be equipped with a thermocouple and a temperature regulator. The temperature in the barrel can be increased from 270~320 ℃ to 370~400 ℃ by section, by throughput and by material, and it is best to use a metering screw with rapid compression (compression ratio of 3: 1). Extruded films (tube type and flat seam type), wire insulation and fiber preparation are all drawn by melt. At this time, the temperature of the melt and the amount of stretching (orientation) are determined depending on the kind of the article. In the preparation of thin-walled products, the speed of the screw is ~ 10r/min, and the plate can reach ~ 70r/min.

3.3. Die casting molding

The die-casting method was carried out at a temperature of 250~370 ℃ (as per? 43? Organic Fluorine Industrial Organo-FluorineIndustry, Phase 3, 2009), an injection pressure of 50 ~ 150MPa and a fine-tuned injection rate. The flow rate of the polymer melt must be stable. The mold should be preheated to 200~250 ℃, and the shrinkage of the polymer melt in the mold varies from 0.9% to 1.5% depending on the wall thickness and molding conditions. When the melt flows in a nozzle of any size, the shear rate is proportional to the rate of movement of the polymer melt and is also related to the rate of movement of the piston. When the shear rate of the melt exceeds a critical value, the melt fractures and delaminates on the surface. In order to prevent the fracture of the melt, the flow rate of the melt should be reduced and a large-diameter casting hole should be used.

4. FEP application areas:

1. The application range of FEP is the same as that of PTFE, which is used in electrical, radio, electronics, chemical industry, machinery manufacturing, refrigeration, medicine and other industrial sectors.

2. FEP is used as film printed board, wire and cable insulation, generator wire winding, electrical insulation parts (sheet, rod, tube, frame and insulator), corrosion-resistant structural products (oil-free lubrication mechanical parts), paint and glass paint cloth. Excellent corrosion resistance makes it used in chemical equipment, heat exchangers, fractionation towers, pumps, valves, pipes, seals, pipe lining, laboratory transparent utensils, etc. FEP extruded thin-walled tubes are used in heat exchangers for heating and cooling strongly corrosive liquids in the range of -200 to 200°C.

3, the use of FEP parts in the refrigeration industry can well withstand the test of low temperature, FEP sheet used to prepare air pressure and vacuum (method) products.

4. FEP is used as wire and cable insulation for various purposes, especially for wires and micro-electronic components of electronic assembly circuits.

5. FEP film is used as a seal for capacitors, diaphragms, and chemical equipment, and is used to make printing plates and flexible cables in the printing industry.

6. The film can be welded, can be vacuum processed, can be coated with metal, the surface does not need to be activated, and can be bonded with metal and glass cloth under heat and pressure.

7. FEP film has a particularly high resistance to gas permeability, so it is used as a diaphragm for separating the sensitive element of the gas analyzer from the analyzed gas.

Shenzhen dankai technology co.,ltd (ShenZhen DanKai Technology co.,ltd.), whose predecessor was the fluorine plastic material factory of dongguan dadi insulation material co.,ltd. established in 1998, specializes in the research and development, production and sales of FEP, PFA, PTFE and other fluorine plastic tube rod sheet membrane products and other insulation materials. The company has international standards of senior R & D team and the introduction of foreign fluorine plastic products production line. Some fluoroplastic products through ISO9001, SGS, FDA certification, Huawei, Foxconn, the United States, ZTE, Intel, AirTAC and other domestic and foreign cooperation customers fully affirmed. The company's main products are: ① pipes: Ptfe pipes, Fep pipes, Pfa pipes, Pvdf pipes; ② Heat shrinkable tubes: Ptfe heat shrinkable tubes, Fep heat shrinkable tubes, Pfa heat shrinkable tubes, Pvdf heat shrinkable tubes; ③ Plate rod film: Ptfe plate rod film, Feep plate rod film, Pfa plate rod film, Pvdf plate rod film, etc. PE: PE, special, spiral tube, spring tube, rotary cutting tube, welding rod, tee, straight, gasket, joint, cone rod, flared tube, sealing tube, braided tube, corrugated tube, etc. At the same time can be customized according to customer requirements processing production of various specifications of fluorine plastic products.