Blue silica gel   is   a  kind  of  indicator  desiccant. the indicator is cobalt (II) chloride, present in a concentration of 0.5 to 1% weight for weight on the amorphous silica gel. 

Color: blue or light blue.Including blue gel indicator, chronotropic silica gel and blue silica gel.Turning from blue to purple  to  pink   after absorbing moistures.

 Use:Mainly used for absorbing moisture,  gauges and equipment in the enclosed conditions. Firstly, a silica gel sachet or breather unit where the
gel has changed colour, gives an immediate warning that it should be
replaced. Secondly, if regenerating the silica gel, the self-indicating grade will
be ready for reuse, when its original colour has returned 

size:  1-3mm,  2-4  mm  4-8mm  etc

packaging:  1-2000g   or   25kg/bag ,about 20mt/20'fcl