Humidity indicators are cards made of stiff paper or with plastic casing, which are impregnated with a humidity-sensitive chemical. These cards change colour when the relative humidity (RH) is exceeded.
The use of these indicators is a very economical way of quantifying RH levels inside sealed packages.
Moisture indicators show when a certain value is exceeded by a change in colour. They are applied to the packaging to be controlled and are a visual proof of the moisture level. They allow to monitor the RH degree from 5% to 95%, depending on the application and need.
It is recommended to use them in combination with desiccant bags. In these applications they are ideal to easily and immediately detect the need to replace the dehydrating or desiccant material in the packaging and to verify that the quality of the product has not been altered.
What are humidity indicators designed for?
There is a vast range of configurations available, and they have a wide variety of applications.