InertSustain Phenyl is an ideal choise when separation cannot be achieved by hydrophobic interactions provided by C18 or C8 columns. InertSustain Phenyl provides pi-pi interactions occuring between Phenyl groups and analytes as well as hydrogen bonding interactions as the secondary interaction. Therefore InertSustain Phenyl is able to retain polar compounds as well.  Also InertSustain Phenyl is available for analysing structural isomers because of its high shape selectivity.