VDSpher HPLC Columns by the German manufacturer VDS optilab are based on spherical silica gels and offer a very wide range of pore sizes and particle diameters to solve all separation problems. VDSpher phases are based on two different basic silica gels: VDSpher Classic and VDSpher PUR. All VDSpher Classic & PUR silica gels are suitable for analytical, semi-preparative and preparative scale. To achieve the best possible column packing, VDSpher PUR phases are a good choice for analytical HPLC and VDSpher Classic phases are especially recommended for preparative chromatography. U-VDSpher columns are ideal for UHPLC applications.