SPE columns ROTI®XBond, DIOL, 2000mg/12mlSPE columns ROTIXBond, DIOL, 2000mg 12ml Material: PP columns with PE filter elements. Further attractive products to complete your chromatography laboratory can be found on our Chromatographypage! Dihydroxy modified silica gel, not endcapped Diol phase, polar. Similar properties to SiOH (unmodified silica gel). In addition to its normal retention resulting from strong hydrogen bonding with analytes, the hydrophobic spacers of its functional groups