LC Column. Shim-Pack XR-ODS HPLC Column, 4.6 x 75 mm The Shim-Pack XR columns have a 2.2 micron particle size for high resolution at elevated flow rates without extreme high pressure. Silica particles of uniform size distribution result in rugged column performance, providing excellent peak shapes, durability, and longevity. Each column includes a performance report and physical properties certificate. Silica based with 120A pore size and 18.4% carbon load. For use with mobile phases from pH 2 to 2.5 and a maximum temperature of 80C (with pH 3 or higher). UltraShield pre-column filter is recommended. Use 220-91539-01 for a single filter, 220-91539-03 for a 3/pk, or 220-91539-10 for a 10/pk.