They are well suited for the chromatography of acidic, neutral and weakly basic compounds, substances found frequently in all analytical fields. A selectivity and performance guarantee makes sure that these parameters remain constant form batch to batch and from year to year. Different modifications are available: RP-8 endcapped, RP-8, RP-18 endcapped, RP-18 and RP-select B. The difference in polarities are clearly described by the selectivity pattern. This can save time and avoid errors when working on new methods.