Gel Permeation Chromatography (GPC) or Steric Exclusion Chromatography (SEC) is used to determine the molar mass of a polymer material.
The GPC/SEC technique can be coupled with RI (refractometer), UV (Ultraviolet-visible) and LS (Low Angle Light Scattering – LALS and Right Angle Light Scattering RALS) detectors. Thanks to these couplings it is possible to characterize a polymer material with precision.