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What Are The Physical Properties And Thermal Properties Of The F46 Tube
- Aug 18, 2018 -

There are a lot of plastic pipes that we use in our lives, but there are a lot of different kinds of plastics, and theyundefinedre made up of different ingredients. Thereundefineds also a big difference in the applicability of each plastic pipe, and the F46 tube is different from the other plastic tubes. Itundefineds a very transparent tube, and today weundefinedre going to introduce its physical properties.


Physical Property

There is no feasible method to determine the molecular weight of F-46 resin. But its melt viscosity at 380 ℃ is lower than that of polytetrafluoroethylene (103-104Pa. S). It can be seen that the molecular weight of F-46 is much lower than that of PTFE. The melting point of F-46 varies with the composition of the copolymer. When the content of hexafluoropropylene in the copolymer increases, the melting point becomes lower. According to the results obtained by differential thermal analysis, the melting point of domestic F-46 resin is between 250 ℃ and 270 ℃, which is lower than that of polytetrafluoroethylene (PTFE). F-46 resin is a crystalline polymer with lower crystallinity than polytetrafluoroethylene. When F-46 melt slowly cools to the temperature below the melting point of the crystal, the macromolecule recrystallizes and the crystallinity is between 50% and 60%. When the melt cooled rapidly by quenching, the crystallinity of the melt was relatively small, and the crystal structure of .F-46 in the range of 40- 50% was spherulite, and there were some differences between resin and processing temperature and heat treatment.

Electrical Insulation Property

The electrical insulation of F-46 is very similar to that of PTFE. Its dielectric coefficient from deep cold to the highest operating temperature, from 50Hz to 1010Hz UHF wide range almost unchanged, and very low, only about 2. 1. The tangent of dielectric loss angle varies slightly with frequency, but not with temperature. The volume resistivity of F-46 resin is very high, which is more than 1015g ·m, and has little change with temperature and is not affected by water and moisture. Arc resistance is greater than 165s. The breakdown field of F-46 increases with the decrease of thickness. When the thickness is greater than 1mm, the breakdown field strength is above 30kV/mm, but does not change with the change of temperature.


Thermal Property

The heat resistance of F-46 resin is second only to that of PTFE, and can be used continuously in the temperature range of-85-200 ℃. Even at the limit of -200 ℃ and 260 ℃, the properties of the system do not deteriorate and can be used for a short time. The thermal decomposition temperature of F-46 resin is higher than that of melting point, and the decomposition temperature is above 400 ℃. The decomposition products are mainly tetrafluoroethylene and hexafluoropropylene. Due to the fact that the equiterminal group of F-46 macromolecules usually dissolves at temperatures above the melting point, it is also necessary to pay attention to appropriate ventilation. F-46 is fairly stable below the melting point temperature when processing above 300 ℃. But the mechanical strength loss is larger at 200 ℃. Figure 2 shows the instantaneous change in the melting index of the F-46 resin at constant temperature. The melting index represents the g number of F-46 flowing through a specified pore size within 10 minutes at 372 ℃ / 5000g gravity. The decrease of melt viscosity and the thermal decomposition of copolymers can be analyzed by increasing melting index. Figure 3 shows the life curve of F-46 and F-4 insulated wires. The F-46 is still hard and brittle at -250 ℃, with small elongation and flexural flexibility, which is even better than polytetrafluoroethylene (PTFE) and is beyond the reach of all other types of plastics.

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