Polar-modified column; available in 3.0, 4.0, 4.6 and 21.2 mm id;  30 - 250 mm length. From the collapse-resistant pore structure of the base silica, to the "wettability" engineered into the bonded phases, Polaris columns have been designed for high aqueous conditions.  The combination of high-phase density bonding, ultra pure silica and silanol shielding leads to excellent peak shape among polar-modified columns.