Agilent, 820950-936, ZORBAX Eclipse Plus C18, 4.6 x 12.5 mm, 5 µm, 400 bar, guard cartridge (ZGC), 4/pk

Agilent ZORBAX Eclipse Plus C18 guard cartridges protect compatible reversed-phase HPLC analytical columns from retained sample contaminants and particulate accumulation. Each guard cartridge contains 5 µm C18 bonded silica with a 4.6 mm internal diameter and a 12.5 mm bed length. Installed upstream of the analytical column in a suitable guard holder, the cartridge can reduce contaminant loading of the main column without replacing sample preparation or inlet filtration. The Eclipse Plus C18 phase is double-endcapped and is intended for reversed-phase separations within a specified pH and pressure range. Match the guard chemistry and connection geometry to the analytical column to avoid introducing different selectivity or excess dead volume. Monitor backpressure and peak shape across injections; replace a fouled guard cartridge before contaminants cause irreversible performance loss in the analytical column. The package contains four cartridges, not four analytical columns.