PVDF is a fluoropolymer like PTFE but with a very different property balance. It is stiffer and stronger, it has a much higher continuous service temperature, and it can be welded. Its chemical resistance is broad but not universal.
Where it wins: chlorine, bromine, strong oxidising acids, halogenated solvents, and hot sulphuric and nitric acid. It is also the standard material for ultrapure water and pharmaceutical piping because it does not leach and can be joined by butt-fusion welding, which PTFE cannot.
Where it fails: strong bases and amines. Sodium hydroxide and potassium hydroxide at moderate concentration will attack PVDF, and ammonia and amine-based compounds cause swelling and eventual stress cracking. If your media is caustic, go to PTFE or to a polyolefin instead. Also watch temperature — PVDF softens noticeably above 140 C, so a lined vessel running at 150 C should be PTFE-lined.
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