Sorry, but there are many additives used when formulating the pvc resin pellets for molding vinyl records, including plasticizers. These are not applied to the stampers, they are formulated when making the pellets for vinyl records.
Read here: https://www.vinylengine.com/turntable_forum/viewtopic.php?t=99579
Quote: “Most of the added (non-polymer) plasticizers are solvent soluble. Studies by preservationists on PVC artifacts has shown plasticizer extraction with solvents, including alcohol (at concentrations 60% and higher) *6. Hence, it is reasonable to keep alcohol (and other solvent) concentrations as low as possible in cleaning solutions.”