Avantor® ACE® CN-ES combines CN polar selectivity with enhanced hydrophobicity, enabling the benefits of both interactions to be fully exploited. Extra phase stability and increased column lifetime is provided by an extended alkyl chain spacer between the silica surface and cyano group. Avantor® ACE® CN-ES is suitable for both reversed phase and normal phase separations. Ultra high purity, base deactivated silica with exceptional reproducibility With hydrophobic plus CN polar selectivity, especially useful for polar molecules Wide range of particle sizes (1,7 µm to 10 µm) and complementary phases Method validation kits contain three different batches of the same phase - available on request These stainless steel columns are available in a wide range of dimensions from capillary to preparative for HPLC and UHPLC separations.