Humidity Indicators

Characteristics of humidity indicators

Humidity indicators serve as a means to check the climate within a confined space, i.e. some kind of packaging. They indicate the relative humidity within a barrier layer.

A humidity indicator consists of particular kind of indicator paper prepared with a thin layer of the chemical combination cobalt (ii )chloride. Cobalt (ii) chloride is blue when in an anhydrous condition. When the paper absorbs humidity from the ambient air, the cobalt (ii) chloride als gets moist. With the degree of moisture increasing, it changes its colour from blue via violet to pink.

The relative humidity within the barrier layer can be read off the impregnated areas of the indicator paper. Its value is shown in percent. Thus you can check if the critical value for the repective product has been exceeded.

Application of humidity indicators

Humidity indicators are mainly used when export packaging needs to be transported in a freight container for an extended amount of time, and through different climate zones. When storing and shipping moisture-sensitive goods, raw materials, electronical equipment, and pharmaceutical products, the use of humidity indicators can be beneficial as well.

Combined with a sufficient amount of the suitable desiccant humidity indicators keep your valuable cargo dry.