Solid, reliable Restek Roc C18 HPLC columns are pressure rated for any 400-bar HPLC system and deliver the peak shape, reproducibility, ruggedness, and performance you demand for all of your conventional HPLC applications. The general-purpose Restek Roc C18 is a conventional monomeric octadecylsilane column suitable for analyses of a wide range of compounds from acidic through slightly basic.