Humidity Indicator Cards (HIC)(Available inventory/ Ordering)
HOW DO HUMIDITY INDICATOR CARDS WORK? 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%. TECHNICAL USE CONSIDERATIONS: Keep in mind that these cards will only indicate the relative humidity. If you want to keep the humidity low in your package whether storing electronics, a wedding dress heirloom, old photographs, or personal items, you will need a desiccant packet to do this. You can compare the color change in this pictureHIC card on the top is outside the bag and shows the humidity is more than 50%. The card sealed in the clear bag along with minipax shows the humidity inside the bag is lower than 10% (all spots are blue). 
This card is reading that the humidity is certainly above 10%, probably around 20% 
This card is reading that the humidity is somewhere around 50% 
Humidity Indicator Card (HIC) Ordering information Main Page | Technology Main | Products | Ordering | Contact Us ©1999-2001 SorbentSystems.Com. All rights reserved. |