Hydrophilic-lipophilic balanced N-vinylpyrrolidone-divinylbenzene resin for SPE. Hydrophilic-lipophilic balanced N-vinylpyrrolidone-divinylbenzene copolymer. pH stability 1–14. Spherical particles 30 µm or 60 µm (standard). Applicable for a wide range of analyte polarities. Water wettable – even if bed runs dry, SPE can be continued.