Shim-Pack XR-ODS II HPLC Column, 1.5mm x 100mm LC Column, The Shim-Pack XR-ODS II is the next generation of high performance XR-ODS column for UFLC. Its 2.2 micron particle size produces high resolution separations, and pore size of 80A maintains the stability and structural integrity of the particles at pressures up to 60 MPa (approx 8700 psi). With extended lengths (up to 150 mm), the XR-ODS II provides excellent separation efficiency with short run times compared to a conventional ODS column of 3 or 5 micron particle size, and allows the use of a variety of mobile phases, including methanol/water, under UFLC run conditions. 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