This document describes the analysis of epoxy resins using Agilent PLgel MIXED-E with Gel Permeation Chromatography. Epoxy resins are thermosetting copolymers that are widely used as general-purpose adhesives, coatings, and composites due to their durability. The analysis is straightforward with Agilent PLgel 3 µm MIXED-E columns, which can analyze low molecular weight samples as well as polymers up to 30,000 MW.