Placed immediately before the column, the precolumn filter traps particles introduced with the sample. For samples, which may irreversibly absorb onto the column, the use of guard cartridges is strongly recommended.

• Protect columns from particulates, ultra low dead volume
• Virtually no dead volume with no band broadening or loss of efficiency
• Compatible with all HPLC columns

Filter HI-704 comprises a stainless steel holder with a 0,020" thru hole and a 2 µm PEEK encapsulated stainless steel frit (supplied).

The fingertight HI-685 precolumn filter includes a 2 µm stainless steel frit which is contained within a PEEK fitting connecting directly onto the column.