BDS-HYPERSIL-C18 5UM250X4.6MM COLUMN. BDS (Base Deactivated Silica) columns have been trusted worldwide for over 20 years. Each column is manufactured with the same exactness and come with a certificate of analysis, ensuring you that each column will perform as promised. These high standards of manufacturing provide you with consistency and reliability year after year, meaning that you will not have to worry about changing procedures when you need to replace your column. Hypersil BDS C18 Columns are economical, general-purpose columns that are perfect for QA and QC labs where reproducibility and long column life are required.