Shim-pack Scepter columns consist of an organic silica hybrid particle for excellent stability and performance under a wide range of LC conditions. The phenylbutyl ligand provides unique selectivity compared to a C8 or C18 due to pi-pi interactions between the analyte and stationary phase. The phenyl phase is recommended for the analysis of aromatic compounds, isomers, and structural analogs, and can be used in 100% aqueous conditions. Max pressure: 100 MPa/1000 bar/15,000 psi. 120A pore size, 17% carbon load, fully endcapped.