Wakopak® Wakosil® SIL Series use two types of silica gel packing agent: the high-adsorbing type, Wakosil® SIL, with a pore size of 6 nm and the low-adsorbing type, Wakosil® SIL-120, with a pore size of 12 nm. Their specific surface areas are 500 m2/g and 300 m2/g, respectively. The larger the specific surface area, the stronger the sample retention and the higher the resolution. Two adsorption quantities can be selected for more efficient analysis.