Waters Gen-Pak FAX columns offer the highest resolution available for anion exchange HPLC of oligonucleotides. These 4.6 x 100 mm steel columns contain a polymer-based, high-performance anion exchange packing. They are designed to perform high-resolution analysis and purification of nucleic acid species such as DNA restriction fragments, polymerase chain reaction (PCR) products, plasmids, and synthetic oligonucleotides.