silica gel Color:blue,white bead form,size 1--2mm,1--3mm,2--5mm supply over 30 kinds of silica gel in different application silica gelColor:blue ... Struture lying between macro-pored and fine-pored silica gel.4) Blue Silica Gel: Lumps or Spherical Sharp, After absorbing Moisture, ... water that form and condense inside the waveguide change the characteristic impedance and frequency, impeding the signal ...