孔徑為60Å                                                                                                      粒徑為40-60μm                                                                                                              *每種填料有封尾和未封尾兩種                                                                                       填料形狀為不定型顆粒                                                                                      用于水溶性基質中pH中性化合物的提取，如抗生素、激素、除草劑、天然毒素、多環(huán)芳烴等，還用于農(nóng)殘樣品凈化過程中油脂的去除。從C2至C30，對化合物吸附作用依次增強，C18和C8是常用的填料，未封尾填料對于極性抗生素和藥物的回收率比封尾更好。                                                                                                                 *硅膠基質填料粒徑還有5-20μm、25-40μm、125-210μm等三種規(guī)格。