Perkin Elmer, N9303909, 10 mm, 4.0 mm I.D., Aq C18 Brownlee Analytical DB Guard Cartridges

The high pressure filter (N9303711) simply contains a filter frit selectable in two different diameters (2.0 mm or 4.0 mm) and two different frit porosities (2.0 μm or 0.5 μm) for basic protection against particulates in the sample or mobile phase. The 10 mm guard cartridge holder without a pre-filter (N9303713) provides protection against compounds that irreversibly absorb onto the stationary phase. The 10 mm guard cartridge holder with a pre-filter (N9303712) provides the ultimate in column protection with a selectable filter frit for elimination of particulates along with a guard cartridge packed with a selectable stationary phase to protection against compounds that irreversibly absorb onto the stationary phase.