The SH-G guard column has a polystyrene divinylbenzene (PSDVB) base with a sulfonated functional group. Recommended for use with SUGAR SH1011 column 220-91524-62. Fulfills USP L17 and L22 requirements. Shipping solvent: water. Coupler 220-91524-99 (double ended) or 220-91524-98 (PEEK tube and fittings) is required.