PTFE — It is a high-temperature resistant chemical material containing polytetrafluoroethylene. It is widely used in packaging, electrical, chemical energy, and corrosion-resistant applications. Generally, they are made by molding polytetrafluoroethylene resin in suspension. They can be formed into sheets, turned into membranes, and made into pipes. They can also be pressed and molded. They can be mixed with graphite to form plates, rods, gaskets, ropes, and raw material tapes.
FEP Chinese name: Polyperfluorobutylene. FEP is formed by the copolymerization of polytetrafluoroethylene and hexafluoropropylene. FEP shares similar properties with PTFE and also has the excellent processing characteristics of thermoplastic plastics, thus making it an important material for replacing polytetrafluoroethylene. FEP is widely used in the production of electrical wires and cables, in transmission lines for electronic equipment used under high-temperature and high-frequency conditions, in connection lines within electronic computers, and in aerospace applications — including special-purpose installation lines, oil and gas well logging cables, oil-immersed motor windings, and micro-motor leads.
Therefore, PTFE material is much more practical than FEP — the reason is quite simple: both PTFE and FEP have extremely strong corrosion resistance and chemical stability. The physical properties of PTFE are slightly harder than those of FEP, and its temperature resistance is higher than that of FEP, approximately 200℃ more. However, PTFE is more difficult to shape, so many complex-shaped parts are made of FEP.
PTFE + FEP = F50, which is a fluoropolymer alloy. This material is also often used in fluoropolymer pumps. When these two materials are used together, they can increase the wear resistance.
Related link: PVDF is polyvinylidene fluoride, which is slightly inferior to PTFE and FEP in terms of temperature resistance and corrosion resistance, and its price is much lower than that of PTFE and FEP.
