Infrared spectroscopic measurements can be utilized in identification and compositional analysis of different kinds of polymers in their pure forms and also in blends. Mid-infrared region spectra can be especially used to differentiate multiple different polymers from one another, while near-infrared region can be used in several production phases, such as in the quality control of the raw materials or monomers, moisture content measurements, and monitoring the quantity of additives during the manufacturing process.