Wakopak® Wakosil®-II 5C18 HG, RS, AR is a column packed with a completely spherical, porous, silica gel-based packing agent. To this column, "Wakopak® Certificate of Analysis", which describes the specification and measured values for "properties of unmodified silica gel" and "characteristics of packing agents after ODS modification" to support of analytical validation and assuring reproducibility within the specifications, is attached.