Inertsil C8-4 Packed Guard Columns manufactured by GL Sciences Inc. are available in 3µm and 5µm partical sizes. The surface area is 450 m2/g and the pore size is 100 Å (10 nm).
Innovative Integra-Guard Columns, Rtx-624, Length 30 m, ID 0.25 mm, df 1.40 μm, Modification: w/5 m Integra-Guard Column, Temp. -20 to 240°C, Restek (CAT#: STEM-C-0334-LC)