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Blue Indicating Silica Gel Beaded 1-3mm


DelSORB® SGBIB13 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.

Typical Properties

Property Value
Particle Size (mm) 1 – 3
Nominal Pore Opening (Angstroms) 20 – 30
Color Change (Indication) Blue to Pink
pH(Slurry) ≈ 4-7
Water Adsorption Capacity
Water Adsorption Capacity @20% RH, 25ºC* (wt%) ≥ 8
Water Adsorption Capacity @35% RH, 25ºC* (wt%) ≥ 13
Water Adsorption Capacity @50% RH, 25ºC* (wt%) ≥ 20
Bulk Density (g/l) ≥ 750
Bulk Density (lb/ft3) ≥ 46
Size Qualification (%) ≥ 97
Package Moisture (wt%) ≤ 2

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.

Currrent SDS – Health and Safety Information is available here.