Outstanding Stability for Maximum Flexibility Purospher® STAR RP-18 endcapped HPLC columns are designed for universal use. They allow basic, neutral, and metal chelating compounds to be separated easily with simple mobile phases – without peak tailing! Based on high-purity silica, the columns offer best all-round retention characteristics, outstanding pH stability from pH 1.5 to 10.5 over a wide temperature range, and suitability for up to 100% aqueous mobile phases. Thanks to this combination, Purospher® STAR RP-18 endcapped HPLC columns allow high-throughput applications, and give you maximum flexibility in choosing the best chromatographic conditions for any separation.