Reversed-phase: C18, C8, Diphenyl

LC-18 (octadecyl) and LC-8 (octyl) are general-purpose hydrophobic alkyl phases that give good peak shape for a variety of compounds. C8 is less hydrophobic than C18; use a mobile phase containing 5% less organic modifier for the C8 column.
LC-DB phases are specially deactivated for basic compounds. These columns provide less retention, better peak shape, and higher efficiency for organic bases than can be obtained on other Type A conventional reversed-phase columns.
LC-DP contains a diphenyl bonded phase that gives greater selectivity for aromatic groups compared to alkyl-type (C18, C8) bonded phases.