Inertsil WP300 Diol Analytical Columns manufactured by GL Sciences Inc. have dihydroxypropyl group bonded to silica gel with pore size 300 Å. The clumns can be used for analysis of large molecules. Same with Inertsil Diol, Inertsil WP300 Diol can be used for both aqueous and organic SEC (Size Exclusion Chromatography). Also, as a diol column, Inertsil WP300 Diol can be used in both normal phase and reversed phase mode. Compared to Inertsil Diol, Inertsil WP300 Diol features silica gel with wider pore size, allowing for separation of compounds with a broader range of molecular weight.