If your Safty Data Sheet has not started downloading, or printing, please use the buttons below to try again.

Print this pageDownload PDF
Delta Adsorbents28 Congress Circle W. Roselle, IL 60172

Phone: 630-980-5205

Fax: 630-980-5286

Yellow Silica Gel

Revised 2015

CHEMICAL FORMULA SiO2 · nH2O + C20H14O4

PRODUCT DESCRIPTION
DelSORB® AY25Bsilica 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 yellow (orange) 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 yellow (orange) to green as it adsorbs moisture. The color typically begins to changes as the moisture content passes 6% by weight and is complete at 14% by weight. A bright green color indicates moisture saturation and that it is time to replace or regenerate the desiccant. DelSORB® AY25B meets the needs of environmentally concerned companies and conforms to European Union requirements for moisture indicating desiccants.

 SPECIFICATIONS

Property Value Unit
Bead Size 2 – 5 mm
Nominal Pore Opening 20 – 30 Angstroms
Color Change Yellow to Green Indication
pH (Slurry) ≈ 7 pH
Water Adsorption Capacity
                             20% ≥ 11 % Weight
                             40% ≥ 22 % Weight
                             80% ≥ 33 % Weight
Bulk Density ≥700 g/l
≥ 44 lbs/ft3
Size Qualification ≥ 97 %
Package Moisture ≤1.5 % Weight

TYPICAL APPLICATIONS
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® AY25BIndicating Silica Gel should not be used in contact with products intended for consumption such as food or pharmaceuticals.

HANDLING & STORAGE RECOMMENDATIONS
Outline in our Current Safety Data Sheet – Click Here