Material Analysis & Materials Testing Lab | Polymer Solutions Plastic Testing, Material Testing, Polymer Analysis, Chemical Analysis, Plastic, Polymer, Testing Polymer Solutions Incorporated (PSI) is an independent materials testing lab and strategic resource for the testing of polymers, plastics, metals, gases, and much more. We have more than 25 years of expertise solving and preventing complex problems for companies in the medical, pharmaceutical, packaging, aerospace, defense, and manufacturing industries.