KNAUER offers four different C18 modifications of Eurospher II materials. They differ in polarity (carbon content) as well as in the applied endcapping, what results in different separation characteristics.
Eurospher II C18 A: 10% carbon content, ∼50% hydrophilic endcapping
Eurospher II C18: 16% carbon content, ∼50% endcapping
Eurospher II C18 H: 17% carbon content, ›99% endcapping
Eurospher II C18 P: 20% carbon content, ∼99% endcapping
Please see the selectivity plots for the phases based on the Tanaka test.