SILNOS® series also play an important role of carrier to absorb and deliver natural oils or extracts. There are two types of SILNOS® series by their shapes. One is hollow type and the other is non-hollow type. Oil absorption classifies SILNOS® series into three types: 100 series, 200 series, and 300 series. Manufacturers, therefore, can choose the most suitable SILNOS® series to apply to their final products. Each average particle size of series is 3, 6, 9 and 20μm and it can be controllable. Various grades of SILNOS® series can provide various functional features on request of customers.