The LC-SCX cation-exchange columns have strongly acidic propylsulfonic acid groups and are used for separating cations. Adjust pH, ionic strength, and organic modifier concentration to control retention and selectivity.. Limit: =70 °C temp. limit. Particle Size: 5 µm. Pore Size: 120 Å. . . Sigma-Aldrich 58997 SUPELCOSIL LC-SCX HPLC Column, 5 µm Particle Size, 4.6mm ID, 25cm Length. Country of Origin : United States. Part Number : 1179R67EA. Pack of : 1.