Indicating Silica Gel (Orange)

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Orange Indicating Silica Gel gradually changes from orange color in the activated condition to to green color in the saturated condition. It can be reactivated by heating at 250-450oF, in a clean atmosphere until it becomes orange again. It meets the requirements for the European Union RoHS.


Orange Indicating Silica Gel is widely used as a relative humidity indicator in dehydrated packages or air drying equipments. It is used as a combination desiccant-relative humidity indicator.

Typical Properties
Property NameProperty Value
Particle ShapeBeaded
Particle Sizes1-3 mm / 2-5 mm
Nominal Pore Size22 Angstroms
Pore Volume, cm3/gm0.43 Avg.
Surface Area, m2/gm750-800
Bulk Density, lbs/ft345 Avg.
Moisture Adsorption at 25 oC
10% RH
20% RH
40% RH
60% RH
80% RH

5.8 Avg.
11.1 Avg.
21.0 Avg.
31.4 Avg.
33.5 Avg.
ColorOrange (Activated) / Green (Saturated)
Moh's Hardness5

Recommended Reactivation Temperature (oF)



1-1/2 lb can, 5 lb can, 30 lb pail and 150 lb drum net of product.

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