... dioxide. Silica gel column chromatography is one with high surface, high purity, the high quality highly selective adsorption materials. Silica gel ... of traditional Chinese herbal medicine components, preparation of high purity substance,etc.1.Improve the resistant compression,break resistant ... ~80mesh),150~250um (60~100mesh),125~130um (80~120mesh)97~150um (100~160mesh),74~150um (100~200mesh),75~97um ...