OL Series SMT SAM-C8 phase with the lowest functional ligand coverage confirmed with carbon analysis results of 6% carbon load. In these series, the proportional ratio of the functional ligand, octal or C8 molecule, mixed with the proprietary spacer molecule, is reduced. The result is a packing material with maximum coverage but much lower functional ligand density. Low density C8 packing material ensures faster mass transfer of solutes during separation. These phases have low hydrophobicity. The spacer molecules protect the substrate from aggressive pH conditions and impact unique selectivity compared with other C8 phases.