In some instances, yes. PVC stands for Polyvinyl Chloride. This is precisely the same material that vinyl is made from. In certain climatic conditions - i.e. when it is too warm - the sleeve might get a bit melty and attempt to merge with the record. While this does not technically destroy the record in the long run, it can spell disaster for the playback of the record, now marred with a bunch of surface noise and hiss.