A humidity indicator card (HIC) is a card on which a moisture-sensitive chemical is impregnated such that it will change color when the indicated relative humidity is exceeded. This item is an inexpensive way to quantify relative humidity levels inside sealed packaging. They are available in many configurations and used in many applications, especially military and semiconductor. The most common humidity indicator cards change color from blue (less than indicated RH level) to pink (greater than indicated RH level).
Humidity indicator cards are also present on many small electronic devices, ranging from cellular phones to laptop computers, for the purpose of alerting the manufacturer that the device has been exposed to high levels of moisture. Humidity Indicating Cards helps monitor desiccant activity and are ideal for use with desiccants in any application where moisture control is critical. Any color change from blue to pink indicates an unsealed container and/or damaging level of humidity.
Standard 6-Spot Humidity Indicator Card, 10% 20% 30% 40% 50% 60% RH, changing of the colour from blue to pink indicates the level of RH inside the packing. For example, if all of the dots are deep blue on a card which is a 10%- 60% card then you can be assured that the humidity in that container is below 10%. This is very important for some products and household items because as long as the humidity is below 40%, basic corrosion (rust) or neither will mildew or mold in clothing or paper products. The purpose of HIC cards is to indicate the level of humidity in a given packing area, say any item with which it is kept. It is advisable to use a transparent packing or the packing material should have a window so that the user can view the level of humidity inside the packing without opening the packing. This particular product when received by the buyer gives an assurance that proper packing was done along with sufficient desiccant use in order to ensure proper delivery.
