PVDF is polyvinylidene fluoride, which is a little worse than F4 and F46. It has low temperature resistance and poor corrosion resistance (price is much cheaper than F4 and F46).
PTFE (F4) is polytetrafluoroethylene, which has good temperature resistance and corrosion resistance. It can withstand the corrosion of any medium. The color is absolutely white. It is generally used for lining fluorine pipes, valves, seals, bars, etc.
FEP (F46) is polytetrafluoroethylene propylene, the color is transparent, corrosion resistance is equivalent to PTFE, generally used for lining fluorine pump or perfluorinated pump.
PFA tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (also known as: perfluoroalkylated, soluble polytetrafluoroethylene)
F4+F46=F50 is a fluoroplastic alloy. This material is also often used in fluoroplastic pumps. They are used together to increase wear resistance.
The chemical properties of PFA FEP PTFE are similar, but FEP can only be used below 200 degrees, and PTFE cannot be injection molded.
Teflon English full name Polytetrafluoroethylene, referred to as Teflon, PTFE, F4
Teflon is divided into PTFE, FEP, PFA, ETFE basic types:
Teflon PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at 260 ° C, with a maximum operating temperature of 290-300 ° C, very low friction coefficient, good wear resistance and excellent chemical stability.
Teflon FEP: FEP (fluorinated ethylene propylene copolymer) non-stick coating melts and flows during baking to form a non-porous film. It has excellent chemical stability and excellent non-stick properties. The maximum operating temperature is 200 °C.
Teflon PFA: PFA (perfluoroalkylated) non-stick coating melts and forms a non-porous film during baking, just like FEP. The advantage of PFA is that it has a higher continuous use temperature of 260 ° C and stronger toughness. It is especially suitable for use in the field of anti-adhesion and chemical resistance under high temperature conditions.
Teflon ETFE: ETFE is a copolymer of ethylene and tetrafluoroethylene. It is the toughest fluoropolymer and can form a highly durable coating with excellent chemical resistance and can be used at 150 ° C. Work continuously.