HPLC Guard Column Cartridge Ultisil ALK C18, 5 µm, 120Å, 4.6 x 10 mm

Ultisil ALK-C18 is a new generation of C18 column introduced by Welch. In this column, hydrophilic groups are bonded into the silica surface, where large number of silanol groups are replaced, reducing the interactions between basic samples and the silanol groups. As a consequence, the selectivity of ALK-C18 is different from that of traditional C18.