Is pressure sensitive label stock recyclable?

It depends on what kind of PS label stock you have. The adhesive is more likely to be recyclable is it is emulsion based. Solvent based adhesives and some hot melts are petrochemical based and are not really good candidates for recycling Likewise, the more permanent label stocks (PVC, polyester, poly pro, etc.) are also petrochemical. Further, it is extremely unlikely that any recycler would be interested in trying to separate the base stock from the adhesive from the silicon in the release liner and the release liner itself.