This type of guard column is used by placing a cartridge guard column inside a dedicated holder. We recommend that you change the guard column frequently because you can change only the cartridge guard column in the contents.

Cartridge guard column Ei is a guard column that can be analyzed with a metal free, because it uses a PEEK material in the contact part of a dedicated holder. It is recommended to avoid contact with metals.

GL Cart guard column are designed as economical type to protect your expensive analytical column. GL Cart is one dimension 5 mm × 4.6 mm I.D..
(Compatible analytical columns’ I.D. is 4.0 mm, 4.6 mm.) GL Cart holder is reusable.

Packed guard column and Mini guard column are designed different with cartridges’ type, using a high pressure to pack it as a guard column, and also can sustain analytical column’s performance.
Packed guard column has length 33 mm and 50 mm two types, and Mini guard column has length 10 mm.