Valve sealing surface material
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I would like to ask an expert: 1. The materials with code F and SA for the valve body sealing surfaces are both described as fluoroplastics. What are the differences between these two materials, including their areas of application? 2. What is the material of the valve body sealing surface when it is PPL? I would like to express my thanks here.
PPL refers to counterpoled polystyrene, a material used for seals
F refers to fluoroplastics. Fluoroplastics are alkane polymers in which some or all of the hydrogen atoms have been replaced by fluorine; they include polytetrafluoroethylene (PTFE), perfluoro(ethylene propylene) (FEP) copolymers, polyperfluoroalkoxy (PFA) resins, polytrifluorochloroethylene (PCTFF), ethylene-trifluorochloroethylene copolymers (ECTFE), ethylene-tetrafluoroethylene (ETFE) copolymers, polyvinylidene fluoride (PVDF), and polyvinyl chloride (PVF). SA refers to tetrafluoroethylene