Cambridge Polymer Group (CPG) is a company providing contract testing, research, and development in the area of material. It offers analytical testing and covers expertise in polymer resins and natural polymers as well as polymer additives and the behavior of these materials in solutions and coatings. The company designs custom instrumentation such as the swell ratio tester (SRT), mechanical testers, magneto rheometer fixtures, filament stretching extensional rheometers, etc.