Indicating desiccant is ideal for use with moisture-sensitive products that are subject to regular inspection because it gives a quick indication of the saturation level of the desiccant.
The primary form of indicating desiccant sold by AGM is bulk indicating silica gel, which is ideal for air drying applications.
Indicating silica gel is a bead or granule that has been washed with a concentration of cobalt chloride (a heavy metal salt). The cobalt chloride is a deep blue color when dry and turns from blue to pink as it becomes saturated with moisture.
AGM also carries orange indicating silica gel. This type is a bright orange color when dry and turns from orange to green as it becomes saturated with moisture. This silica gel conforms to European Union requirements for moisture-indicating desiccants.
Due to the presence of cobalt chloride, indicating silica gel desiccant should NEVER be used in direct contact with products for consumption, such as food or pharmaceuticals.
Indicating silica gel desiccant is also available in special packet sizes for use in electronics, pharmaceutical, or food packaging.
AGM also provides bulk indicating molecular sieve. This indicating molecular sieve provides a higher capacity for water adsorption than silica gel at lower humidity levels while providing a similar indicating element. While the indicator beads are blue, the desiccant bed is active. As the indicator beads turn to a lighter shade of blue, the desiccant is approximately 60% saturated. When the indicator beads turn beige, the desiccant has reached equilibrium capacity and should be replaced.