This dataset is the supporting information for a research article. It contains S1: Metadata visual experiments for PA6 dissolution in solvents, S2: Experimental details of DSC method, S3: Metadata PA6 DSC experiments, S4: Metadata PET DSC experiments, S5: Raw data DSC experiments for PA6 and PET dissolution in solvents (csv and pdf), S6: Particle size distribution of PA6p, PETp and rPA6, S7: Crystal structure PA6p, PETp and rPA6 by XRD, S8: Molecular weight distribution of PA6g, PETg, rPA6 and rPET by GPC, S9: Gas chromatograms of rMeOH, S10: Solvent suitability for selective dissolution. PA6: polyamide 6, PET: polyethylene terephthalate, MeOH: methanol.