ODL Series: SMT SAM-C18 phase with the lowest functional ligand coverage confirmed with carbon analysis results of 12% carbon load. In these series, the proportional ratio of the functional C18 molecule, mixed with the proprietary spacer molecule, is reduced. The result is a packing material with maximum coverage but much lower functional ligand. Low density C18 packing material ensures faster mass transfer of solutes during separation. These phases have much lower hydrophobicity compared to the standard SMT OD-series. The spacer molecules protect the substrate from aggressive pH conditions and impact unique selectivity compared with other C18 phases.