Guard Column Selection

How to Select a Guard Column

The guard column is installed between injector and analysis column, it is mainly used to protect the analysis column. There are two types guard column: cartridge replaceable type and packing type. The cartridge replaceable type can be used by placing a cartridge guard column inside a holder.

Packed type guard column is packed in a stainless tubing same as an analytical column.

Guard Column Configuration
Analytical Column I.D. for connection
Guard Column Length
 Cartridge Exchange Type (need specific holder)
Cartridge Guard Column E
First Choice as Guard Column
1.0 mm - 1.5 mm
10 mm
2.1 mm - 4.6 mm
Cartridge Guard Column Ei
Guard column with wetting is non-metal
1.0 mm - 3.0 mm
10 mm
Guard Column for UHPLC
The max. operating pressure is up to 80 MPa, 800 Bar.
1.0 mm - 3.0 mm
10 mm
Usable for various ODS columns
3.0 mm - 4.6 mm
10 mm
GL Cart
Only one size but reasonable
4.0 mm, 4.6 mm
5 mm
 Packed Type
(no need specific holder)
Packed Guard Column
Packed type same as analytical column
1.0 mm - 4.6 mm
33 mm, 50 mm
Packed Mini Guard Column
Type with shorter length of the packed guard column
4.0 mm, 4.6 mm
10 mm
Preparative Guard Column
Packed guard column for preparative column
6.0 mm - 100 mm
50 mm
75 mm
for 50 mm I.D.
100 mm
for 100 mm I.D.
50 mm
75 mm (for 50 mm I.D.)
100 mm (for 100 mm I.D.)

How to Select the Packing Material

We recommend to select a guard column with a same packing material of your analytical column. SILFILTER STD C18 can be used for any type packing material of ODS columns.

How to Select the Dimension

Particle Size: We recommend to select same particle size of packing material of your analytical column.
I.D.: Select I.D. of guard column correspond to your analytical column’s I.D..

How to Connect to Analytical Column

When connecting the guard column to analysis column, connecting parts, such as pipes and connectors, are required in addition. Pre-column couplers and other components are provided as connecting parts.

  • →Detail of Pre-column Coupler