28 Congress Circle W.
Roselle, IL 60172
Phone: 630.980.5205

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