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Blue Indicating Silica Gel Granular


DelSORB® SGBIG 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.


Property Value Unit
Granular Size 1.5 – 3.0 mm
Nominal Pore Opening 20 – 30 Angstroms
Color Change Blue to Pink Indication
pH(Slurry) ≈ 7 pH
Water Adsorption Capacity
20% ≥ 11 % Weight
40% ≥ 22 % Weight
80% ≥ 33 % Weight
Bulk Density ≥ 780 g/l
≥ 48 lbs/ft3
Size Qualification ≥ 97 %
Package Moisture ≤ 1.5 % Weight

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, DelSORB® AB25B Indicating Silica Gel should not be used in contact with products intended for consumption such as food or pharmaceuticals.

Outline in our Current Safety Data Sheet – Click Here