Poly(ethylene succinate) is a biodegradable polyester polymer commonly used as a liquid stationary phase in gas chromatography (GC). It excels in separating polar compounds due to its polar functional groups and is supplied as a white to light yellow powder or crystals, which is typically dissolved in a solvent for column coating. This reagent provides good thermal stability and selectivity for esters, alcohols, and other polar analytes in analytical applications. While it has broader uses in biodegradable plastics and medical devices, in this context, it serves as a niche additive for chromatographic separations, supporting precise laboratory analysis.