A Complete Guide to Humidity Indicator Cards
Humidity in the air can wreak havoc on packed materials, causing corrosion and growth of mold. With temperature changes, condensation can be a major problem as well. While you can place a desiccant in the packaging to absorb moisture for a while, but desiccants eventually lose their effectiveness and need replacing. By knowing the level of humidity in a transit case or shipping container, you can take action before any damage occurs. This is where humidity indicator cards come into play. What are Humidity Indicator Cards? Humidity indicator cards are cards that are impregnated with materials that change color when indicated relative humidity is exceeded. Usually, it is a blotting paper that has been impregnated with cobalt (II) chloride base. Less toxic alternatives available in the market include other chemicals such as cobalt-free chloride base and special plastic films. Humidity indicators are a relatively inexpensive way to indicate humidity inside any sealed packag