NewGuard cartridges are small guard cartridges (15 mm x 3.2 mm ID) packed with 5 or 7 µm sorbents. They help to prolong column life by eliminating particulates, contaminants, and strongly bound sample components; acting as replaceable disposable heads of your analytical column. There is negligible loss of efficiency and little effect on retention or resolution. NewGuards are available in a convenient 3-pack and can be coupled directly to any MPLC cartridge with a union (07150018), or any LC column using the stand alone holder (07150001).