High performance type of YK-421 suitable for mono- and divalent cation separations. Supports the analysis of alkylamines and transition metals. Fulfills USP-NF L125 requirements. Base material: polyvinyl alcohol, stainless steel hardware. Shipping solvent: 10 mM sodium sulfate. Guard column YS-G (220-91524-07) and stainless steel coupler 220-91524-97 are recommended.