Shim-pack GIST Amide Guard column the guard column for Shim-pack GIST Amide columns. It is ideal for highly polar compounds as it shows strong rentention for this analytes even more so that other HILIC phases such as silica and diol. It exhibits excellent stability in high aqueous eluent and is suitable for LCMS analysis. This column has no capping, a carbon load of 15%, a pore sizer of 10nm, and a pH range of 2 - 8.5. USP L68.