Functional acrylate esters have many uses, but spontaneous polymerization is almost impossible to suppress. Since this may affect the quality of the final product, an assay for the impurity profile is needed. Here, perchloric acid is used because of its good UV transparency and to ion-pair with this small, basic, and hydrophilic molecule. The Acclaim PolarAdvantage column was chosen for its tolerance for highly aqueous mobile phases.