1. What is PFA tube?
Sanfulai PFA pipe is a pipe that is extruded and injected by PFA resin raw materials. Generally it means the extruded type. It bears the following excellent properties and can be formed by various melting resin forming methods.
●Excellent heat resistance: maintains mechanical strength in a wide range of temperatures from -200 ° C to 260 ° C.
●Excellent chemical resistance: almost inert to all chemicals.
●Excellent electrical characteristics: low dielectric constant and low dielectric loss factor at high frequencies; insulation.
●Excellent flame retardancy: limiting oxygen index 95Vol%(UL94V-0).
2. How is PFA pipeline welded?
PFA pipeline welding methods are mainly as follows:
（1）Hot plate welding method: This method is to use a heating plate to heat the PFA pipe, heat it to the softening temperature, and then gently press it on the welding clamp for a period of time, so that the pipe and the pipe mouth welded together. This method is suitable for welding PFA thick pipe joints with small diameter.
（2）Frictional fusion welding method: This is an efficient method to generate heat through high-speed friction, melt the PFA material, and then insert the tube mouth into the welding clamp to form a uniform weld. This method is suitable for large diameter PFA thick pipe joints.
（3）Ultrasonic welding method: This method uses the heat generated by high-frequency vibration to melt and weld the PFA material together, and the weld is uniform and flawless. This method is suitable for PFA thick pipe joints with high requirements for interface quality.
（4）Hot melt welding: This is a more common method for PFA pipes, by heating the ends of the PFA pipe and pipe fittings, so that they melt and join together. In the process of hot melt welding, it is necessary to use a special electric air gun or electric furnace for heating, and it is also necessary to use PFA welding rods for filling.
（5）Electric fusion welding: This is also a common welding method for PFA pipes, which uses an electric heating plate to heat the ends of the pipes and fittings so that they fuse and join together. In electric fusion welding, it is necessary to use special welding equipment such as PFA welding sleeve and PFA welding plug.
（6）Solution welding: This is a more complex PFA pipeline welding method that requires the use of gas shielded welding. In the welding process, special welding equipment, such as TIG argon arc welding machine, must be used.
No matter which welding method is used, the welding process should strictly comply with the operating procedures and safety standards. After the welding is completed, strict quality inspection and testing are also required to ensure that the welding quality meets the requirements and ensure the safe operation of the pipeline.
3. How to connect the PFA tube?
There are a variety of connection methods for PFA tubes, and the specific choice depends on the needs of the actual application and environmental conditions. The following are several common PFA pipe connection methods are joint connections. These include:）
（1）PFA welded joint connection: Using dedicated hot melt welding equipment and technology, PFA pipes of different lengths are connected by hot melt welding. This method requires professional technology and equipment to ensure that the connection is strong and leak-free.
（2）PFA flaring joint connection: Two or more PFA pipes are joined together using a special Dankai PFA flaring joint. This method of connection does not require welding, but it is necessary to ensure that the joint is properly installed to prevent leakage.
（3）PFA sleeve joint connections: Suitable for PFA pipes that need to be changed or moved frequently. PFA sleeve connectors provide a simple connection and are often used in scenarios that require frequent maintenance and disassembly. (The fitting is usually PTFE or PVDF fitting)
（4）PFA flanges: In some PFA piping systems, PFA flanges are used to connect different types of pipes or equipment. Flange connections provide a secure and easy to remove connection, while ensuring that high purity PFA gaskets are used between flanges to avoid contamination.
（5）PFA external joint connections: PFA external joint connections are commonly used when PFA pipes need to be connected to other pipes or equipment. These joints include PFA outer tooth straight, PFA outer tooth elbow, PFA outer tooth tee, etc. Sealing tape should be applied to the external thread when connecting to ensure tightness.
（6）PFA plug connector is connected. One end of the pipe is connected to the PFA connector,
Due to the relatively expensive PFA joint, some factories will choose Dankai PTFE sleeve joints or PVDF sleeve joints, or PP joints according to the scene, and also choose 304 or 316 stainless steel metal joints.
（7）PFA entry bead connection. Two or more PFA pipes are joined together using a special PFA entry bead joint. This method of connection does not require welding, but it is necessary to ensure that the joint is properly installed to prevent leakage.
When selecting the appropriate connection method, it should be determined according to the specific application needs and environmental conditions, and ensure that all connections are properly installed and sealed to prevent any form of leakage or contamination.
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