... pore size: 60A and 90A Column Chromatography Silica gel (silica gel,column chromatography silica gel,silica gel for column chromatography)Please try SANPONT ... ,compared with organic column padding, silica gel is a solid, colloidal gel based on SiO2 matrix,its structure is compact, so ... even be directly thrown away, the silica gel will not pollute ...