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description: These resins are available in 3 different bead sizes. The medium (75-150?m diameter) and large (150-300?m diameter) beads are most useful for gravity flow and batch (non-flow) applications. The larger size of the beads makes for ready flow and easy separation from a bulk liquid. The medium (75-150?m diameter) and small (40-75?m diameter) beads are most useful for pumped applications. The smaller size of the beads reduces the chromatography plate height (provides more rapid equilibration at higher flow rates).