The amorphous form of silicon dioxide that is synthetically produced in a hard form of irregular granules or beads is silica gel. A very large surface area of 800 square meters per gram is given by a micro porous structure of interlocking cavities.
Silica gel is a high capacity desiccant because of this structure. The exhibition of a lower vapor pressure than the surrounding air causes water molecules to adhere to the gels surface. Once pressure reaches equilibrium, there is no more absorption. The result from higher humidity of the surrounding air is a greater amount of water absorption before equilibrium is reached. Stored or in- transit items are susceptible to damage in humidity conditions higher than 50 % relative humidity.Read More