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It is made of the top qualitysilica gel with fine workmanship. Due to the duration time difference ofabsorption to different substances composition, this kind of silica gel can reach the purpose ofseparation and purification of mixed composition of different substances, forinstance, silica matrix to pack into micro spin column to form a silica-matrixmembrane for sample purification. It's used in refining of oil products forremoving aromatic hydrocarbon substance or used in refining of oil products forremoving aromatic hydrocarbon substance or used in separation, purification ofeffective composition of Chinese herbal medicine as well as in preparation ofhighly pure substance and medical flow aid,also used for color-metricdevice and packed into spin micro-centrifugecolumn for purification of nucleic acid