The shelf life of humidity indicator cards is typically 12 months, but can be extended to 24 months under specific sealed storage conditions.
Most humidity indicator cards have a shelf life of 12 months when unopened, sealed, and with a desiccant. For example, Clariant humidity indicator cards have a shelf life of 12 months when stored in a tightly sealed tin can, away from direct sunlight and humid environments.
Some products, such as six-point humidity indicator cards (10%-60% range), can have a shelf life of up to two years under proper storage.
There are also general-purpose humidity cards that specify a shelf life of 12 months. After opening, any remaining cards must be resealed and stored in a cool, dry place.
It is important to note that once the packaging is opened and the card is exposed to air, its effectiveness will be affected by ambient humidity, and the original shelf life will no longer apply. Therefore, it is recommended to use the card as soon as possible after opening and to tightly seal any unused portions.
