Welch Materials HPLC Guard Column Cartridge Topsil Phenyl-Hexyl, 3 μm, 150Å, 4.6 x 10 mm, 2 pc/PAK

Topsil is Welch’s Next Generation Silica, with larger pore size and greater surface area, distinguishing Topsil stationary phases from those in our Ultisil Series.