dongguan weiyi electronic technology co., Ltd

WHAT ARE THEY?
"Humidity Indicator Card (HIC) A card on which a moisture-sensitive chemical is printed such that it will change color from blue to pink when the indicated relative humidity is exceeded. This is packed inside the moisture-sensitive bag, along with the desiccant, to aid in determining the level of moisture to which the
moisture-sensitive devices have been subjected.” (IPC/ JEDEC J-STD-033D Section 1.5.7)

WHY USE THEM?
Humidity indicator cards are impregnated with a solution of cobalt chloride that has been carefully mixed to change color from blue through various shades of magenta - red, to a pink. These cards are not precision indicators. However, they are very good at telling you the maximum possible humidity in a container. For example if all of the dots are deep blue on a card which is a 10%- 60% card than 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) will not occur. Neither will mildew or mold in clothing or paper products. Finally, all sophisticated electronics: video cameras, computers, SLR cameras, sophisticated instruments etc. enjoy a much longer and more reliable life if they are maintained at a very low relative humidity. For example, at the bottom of this page are cards that were developed specifically for the electronics (computer chips) industry. These companies require that the humidity in their shipping packages be below 10% and as of the guidelines established in the fall of 1999 are striving to maintain humidity below 5%.

BENEFITS
As relative humidity(RH) increases, the color spots turn blue (dry) to pink (wet) . As RH
decreases, the color changes from pink, light purple to blue back.
Indicate humidity conditions in various types of barrier packaging
Often used in conjunction with a desiccant
Allow instant visual verification of product integrity
Approved for MIL - I - 8835 applications
LOW COST
Spots turn from Blue to Pink to indicate humidity levels