silica gel blue,white bead form,size 1--2mm,1--3mm, ... CAS No.7631-86-9Color : white or blueSize : bead form or granular form, from 0.2--1.0mm,1--3mm ... Lumps or Spherical Sharp, After absorbing Moisture, it turns from blue to red, visually indicating the relative humidity of ... various substance, it can achieve the separation and purification from the mixed components, used for refining petroleum and ...