Indicating silica gel is a blue silica gel that gradually changes from a deep blue in the activated condition to a pale pink in the saturated condition. Each color corresponds to a definite relative humidity. It can be reactivated by heating at 250-450 oF, in a clean atmosphere until it becomes blue again. It meets the requirements of Military Specification Mil-D-3716, Type IV, Grade H (High Adsorption Capacity).
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.
|Property Name||Property Value|
|Particle Shape||Granular or Beaded|
3-8 Mesh / 6-12 mesh / 6-16 Mesh
|Nominal Pore Size||22 Angstroms|
|Pore Volume, cm3/gm||0.43 Avg.|
|Surface Area, m2/gm||750-800|
|Bulk Density, lbs/ft3||45 Avg.|
|Moisture Adsorption at 25 oC|
|Color||Blue (Activated) / Pink (Saturated)|
Recommended Reactivation Temperature (oF)