FWIW, the record is a blend of polyvinyl chloride (PVC) and polyvinyl acetate (PVA), and together under heat they form a copolymer (once formed does not separate) and is sometimes called polyvinyl chloride-acetate (PVCa); and there are various types of PVCa depending on the quantity of PVA. PVA is what mostly provides the flexibility but should not be confused with flexible PVC that has plasticizer added which is actually a solvent and the plasticizers used can be extracted and over time can migrate from the PVC. If the record actually used any amount of plasticizer, it would never last as long as it can (>100 yrs).
So, while its common to call the record PVC or vinyl, it's not, but these are easy and accepted terms.