Yellow Indicating Silica Gel Beaded

CHEMICAL FORMULA SiO2 ∙ nH2O + (NH4)2SO4 • FeSO4 • 6H2O

PRODUCT DESCRIPTION
sSORB yellow (orange) to clear indicating silica gel is a synthetically modified silicon dioxide that has been purified and processed into a hard, smooth bead. 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 clear as it adsorbs moisture. clear color indicates moisture saturation and that it is time to replace or regenerate the desiccant.

Typical Properties

Property Value Value
Particle Size (mm) 1-3 2-5
Particle Type Bead Bead
Type A A
Nominal Pore Opening (Angstroms) 20 - 30 20-30
Water Adsorption Capacity @20% (wt%) ≥ 8 ≥ 8
Water Adsorption Capacity @40% (wt%) ≥ 13 ≥ 13
Water Adsorption Capacity @80% (wt%) ≥ 20 ≥ 20
Bulk Density (g/l) ≥ 700 ≥ 700
Bulk Density (lb/ft3) ≥ 44 ≥ 44
Size Qualification (%) ≥ 97 ≥ 97
Package Moisture (wt%) ≤ 5 ≤ 5

TYPICAL APPLICATIONS
As 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 packed goods, drying and storage of flowers and seeds, etc. Due to the addition of the moisture indicator, sSORB yellow indicating silica gel should not be used in contact with products intended for consumption such as food or pharmaceuticals.

PACKAGING INFORMATION
sSORB yellow to clear indicating silica gel is available in 55 kg poly bags.

HANDLING & STORAGE RECOMMENDATIONS
Store sSORB silica gel in a dry location to prevent premature water adsorption. Reseal packages after opening to prevent contamination and unintended water adsorption. We recommend that you rotate stock so oldest material is used first.

 

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