孔径为60Å                                                                                                      粒径为40-60μm                                                                                                              *每种填料有封尾和未封尾两种                                                                                       填料形状为不定型颗粒                                                                                      用于水溶性基质中pH中性化合物的提取，如抗生素、激素、除草剂、天然毒素、多环芳烃等，还用于农残样品净化过程中油脂的去除。从C2至C30，对化合物吸附作用依次增强，C18和C8是常用的填料，未封尾填料对于极性抗生素和药物的回收率比封尾更好。                                                                                                                 *硅胶基质填料粒径还有5-20μm、25-40μm、125-210μm等三种规格。