We have guard cartridges and holders available for Raptor 1.8 µm UHPLC columns. As an alternative for UHPLC, you may find an in-line filter to be beneficial.
UltraShield UHPLC Precolumn Filter
UltraLine UHPLC In-Line Filter
Similar to our Trident direct guard system, the UltraShield filter screws directly into the column end fitting at the inlet. The UltraLine filter requires a tubing connection on either side; if it is installed between the injector and the column, the EXP coupler is recommended.
The other difference is in the frits, or filters as you may call them. The UltraShield unit has a titanium filter that is not replaceable. Therefore, the whole filter assembly is used as a disposable item. On the other hand, the UltraLine filter has a replaceable stainless-steel filter, and more of them can be ordered as needed.
Filters in both units have a porosity of 0.5 µm, and both holder assemblies are leak tight up to a pressure of 15,000 psi. Therefore, they are functionally equivalent.
The UltraShield filter is compatible with any family and phase of Restek UHPLC columns, whereas the Raptor UHPLC guards are compatible with matching phases of 1.8 µm Force and 1.9 µm Pinnacle DB UHPLC columns.
For more details, see our LC guard column selection guide.
