Shim-pack Bio IEX: Ion Exchange Chromatography Columns. Shim-pack Bio IEX Columns are available in Q (quaternary ammonium) and SP (sulfopropyl) chemistries and are based on porous (Q and SP columns) and non-porous (Q-NP and SP-NP columns) hydrophilic polymers with low nonspecific adsorption. The porous particles offer excellent binding capacity with exceptionally high efficiency and the non-porous particles offer high efficiency and exceptional resolution. Shim-pack Bio IEX: SP-NP, Particle: hydrophilic non-porous, Particle Size: 3?m, 5?m, Ligand: -(CH2)3SO3, pH Range: 2 - 12