Quality control of polyethlene terephthalate using NIR spectroscopy

In this application note, Metrohm demonstrates how the DS2500 Solid Analyzer, operating in the visible and near-infrared spectral region (Vis-NIR), promises a cost-efficient and fast solution for a simultaneous determination of the diethylene glycol content, isophthalic acid content, intrinsic viscosity, and the acid number in polyethylene terephthalate (PET). This application note highlights NIR spectroscopy as a method for the rapid analysis of PET without the need for sample preparation or chemical reagents.