PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
What are the characteristics of polytetrafluoroethylene (PTFE) tubes and what are the connection methods?
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Release time:
2024-03-06
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1. teflon tube is what?
PTFE pipe is the use of high-quality plunger extrusion pipe, the use of special processing technology, so that the steel pipe and plastic pipe closely combined, can withstand positive pressure 1.6Mpa, negative pressure: 77Kpa; can be in -60 ℃ ~ 260 ℃ within the normal use, with reliable and excellent corrosion resistance. Transporting strong corrosive gases and liquids at high temperatures, which cannot be replaced by other pipelines.
What are the characteristics of 2. PTFE tube?
Polytetrafluoroethylene (PTFE) is a super-stable material that resists all strong acids, alkalis and strong oxidants, and does not react chemically with any organic solvent. It is excellent in a very wide temperature range, whether it is minus 80 ℃ or 260 ℃ high temperature environment, can be long-term stable work, even in 260 ℃ high temperature continuous use for 1000 hours, its physical properties change very little.
PTFE has a very low coefficient of friction, which means it is an excellent antifriction and self-lubricating material, with low resistance at start-up and smooth operation. Because it has no polarity, heat resistance and does not absorb water, it is also a top electrical insulating material. In addition, PTFE has excellent aging resistance, is not easy to adhere to other substances, and has flame retardancy.
Connection method of 3. PTFE pipe
1. Hot melt butt joint: suitable for the connection of large diameter PTFE pipe. First, the end faces of the two pipes to be connected are precisely cut to remove burrs, and then hot-melt and butt-joint are carried out on special equipment through set temperature and pressure, so that the materials are evenly melted and tightly combined. (Most need special treatment)
2. Embedded metal pipe connection: This method is to embed metal pipes (such as stainless steel or copper pipes) into PTFE pipes in advance, and then connect with other equipment or pipes by means of flanges and ferrule.
3. Threaded connection: For small-diameter PTFE pipes, external or internal thread connection can be used. Due to the wear resistance and self-lubrication of PTFE itself, although threads can be made directly, relaxation may occur under long-term load due to its large cold flow. Therefore, special metal bushings are usually installed in the threaded part, which not only enhances the mechanical strength of the connection parts, but also prevents the connection failure caused by the material characteristics.
4. Socket welding: This is a more professional connection technology, which is mainly used for the connection of PTFE pipes that require high sealing or pressure resistance. During operation, specially designed socket welding molds and equipment are required to apply heat and pressure to the pipe interface to make the PTFE material reach a molten state and fuse with each other, and form a firm joint after cooling.
5. Adhesive connection: the use of special formula of PTFE glue, used for the connection of smaller diameter PTFE tube, especially suitable for the implementation of hot melt docking or mechanical connection. However, it should be noted that the connection strength and sealing performance of this method are relatively low, and are greatly affected by process conditions and environmental factors.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
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