Blue Indicating Silica Gel is the naturally occurring mineral silicon dioxide that has been purified and processed into a hard, smooth beaded form. The beads are then saturated with a moisture indicating solution that gives them a deep blue color when dry. It is also known as a narrow pore silica gel and has a vast network of interconnecting pores with diameters of 20-30Å. These pores have a strong affinity for moisture and use physical adsorption and capillary condensation to trap and hold it. Silica gel will remove moisture at temperatures as high as 220°F, but is best used at room temperature (70-90°F) and high relative humidity (60-90%Rh). The color changes from blue to purple to pink as it adsorbs moisture.

Delta’s Clear View Pillow Pak line allows you to see when the desiccant is used, The Blue Indicating silica gel will turn from blue to pink when the adsorption is complete. The clear view packet allow for the silica gel to be regenerated by heat. This product can be used over and over. 

As a primary desiccant or blended with other desiccants in any application where visual control of moisture is required, such
as compressed air dryers, gas drying, breathers, for protection of non consumable packaged goods, drying and storage of
flowers and seeds, etc.

Due to the addition of the moisture indicator, Indicating Silica Gel should not be used in contact with products intended for consumption such as food or pharmaceuticals.

Product Spec Sheet