PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
What material is Fep?
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
PFA tube little sister
Release time:
2019-04-29
Visits:
FEP is mainly a kind of high temperature resistant material, the material is mainly transparent, FEP high temperature corrosion resistance, FEP acid and alkali resistance, FEP wear resistance, FEP temperature 200 degrees, FEP is a special fluorine material.
FEP crystalline melting point of 580F, density of 2.15g/cc (grams/cubic centimeter), it is a soft plastic, its tensile strength, wear resistance, creep resistance is lower than many engineering plastics. It is chemically inert and has a low dielectric constant (2.1) over a wide range of temperatures and frequencies. The material does not ignite and can prevent the spread of flame. It has excellent weather resistance and low friction coefficient, which can be used from low temperature to 392F. The material can be made into granular products for extrusion and molding, as powders for fluidized beds and electrostatic finishes, and also into aqueous dispersions. Semi-finished products have film, plate. Rods and single fibers. Its main use is for the production of tubes and chemical equipment in the village, drum surface and a variety of wires and cables, such as aircraft hook lines, pressurized cables, alarm cables, flat cables and oil well logging cables. FEP films have been used as thin coatings for solar collectors.
F-46 resin has both the characteristics similar to polytetrafluoroethylene and the good processability of thermoplastics.
Performance
The content of hexafluoropropylene in the F-46 has a certain effect on the performance of the copolymer. The content of hexafluoropropylene in the F-46 resin currently produced is usually around 14%-25% (mass fraction).
1 Physical performance
F-46 molecular weight determination of resin, there is no feasible method. However, its melt viscosity at 380°C 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 polytetrafluoroethylene.
The melting point of the F-46 varies with the composition of the copolymer, and the melting point becomes lower as the content of hexafluoropropylene in the copolymer increases. According to the results of differential thermal analysis, the melting point of domestic F-46 resin is mostly between 250-270 degrees C, which is lower than that of polytetrafluoroethylene.
F-46 resin is a crystalline polymer, the crystallinity is lower than polytetrafluoroethylene, when the F-46 melt is slowly cooled to the temperature below the melting point of the crystal, the macromolecule re-crystallization, the crystallinity is between 50%-60%; When the melt is rapidly cooled by quenching, the crystallinity is small, between 40%-50%. The crystal structure morphology of the F-46 is spherulite structure, and it varies with the resin and the processing temperature and heat treatment method.
2 Electrical insulation performance
The electrical insulation properties of F-46 and PTFE are very similar. Its dielectric coefficient is almost unchanged from cryogenic to maximum operating temperature, from 50Hz to 1010Hz UHF, and is very low, only about 2.1. The dielectric loss tangent varies somewhat with frequency, but not with temperature.
The volume resistivity of F-46 resin is very high, generally greater than 1015?.m, and changes little with temperature, and is not affected by water and moisture. Arc resistance is more than 165s.
The breakdown field of the F-46 increases with the decrease of the thickness. When the thickness is greater than 1mm, the breakdown field strength is above 30kV/mm, but it does not change with the change of temperature.
3 Thermal performance
The heat resistance of F-46 resin is second only to polytetrafluoroethylene, and it can be used continuously in the temperature range of -85- 200 ℃. Even in the extreme cases of − 200 ° C. and 260 ° C., its performance does not deteriorate and it can be used for a short time.
The thermal decomposition temperature of F-46 resin is higher than the melting point temperature, and significant thermal decomposition occurs above 400 ℃, and the decomposition products are mainly tetrafluoroethylene and hexafluoropropylene. Since F-46 macromolecules usually carry other end groups that decompose at temperatures above the melting point, proper ventilation must also be paid attention to when processing above 300°C. The F-46 is fairly stable below the melting point temperature, but the loss of mechanical strength is large at a high temperature of 200°C. Figure 2 is the instantaneous change of the melt index of the F-46 resin at constant temperature, the melt index represents the number of grams of F-46 flowing through the specified aperture in 10min at 372 degrees C, 5000g gravity, therefore, the increase in the melt index can be used to analyze the reduction of melt viscosity and the thermal decomposition of the copolymer. 3 is a life curve of a F-46 as compared with a F-4 insulated wire.
F-46 at -250 ℃ is still not regularly hard and brittle, but also to maintain a small elongation and a certain degree of flexibility, even better than polytetrafluoroethylene, is all other types of plastic.
4 Chemical resistance
The chemical resistance of F-46 is similar to that of polytetrafluoroethylene and has excellent chemical resistance. In addition to the high temperature of the fluorine element, molten alkali metal and chlorine trifluoride reaction, and other chemical contact are not corroded.
5 Mechanical properties
Compared with PTFE, F-46 hardness and tensile strength are slightly improved, and the friction coefficient is slightly larger than PTFE. At room temperature, F-46 has good creep resistance; but when the temperature is higher than 100 ℃, the creep resistance is not as good as PTFE.
6 Other performance
F-46 resin has very good oxidation resistance in the atmosphere and high atmospheric stability. The radiation resistance of F-46 is better than that of polytetrafluoroethylene and slightly inferior to that of polyethylene. In air and room temperature, the minimum absorbed dose at which the F-46 begins to change is 105-106rad? 103-104Gy, so it can be used as a radiation-resistant material.
FEP materials can do a lot of things. Dankai Technology Company mainly uses FEP to make FEP tubes, FEP heat shrinkable tubes and FEP films. The uses of each company are different.
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