The Shim-pack GIS C18 preparative column provides reliable scaleup from an analytical GIS C18 column. The 10um particle size results in low backpressure at elevated flow rates. Uniform particles and high surface area provide high loading capacity and symmetrical peak shapes. USP L1, pore size: 100A, surface area: 450 m2/g, 15% carbon load, pH range: 2 to 7.5, fully endcapped. A guard column is recommended to prolong the lifetime of the column. Method development on an analytical GIS C18 column is highly recommended before purchasing a prep column. Prep columns cannot be returned or exchanged once used. Similar to Premier Elite 220-97350-77.