The principle of Humidity Indicator Cards HIC

Nov 26, 2019

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The principle of Humidity Indicator Cards HIC


Humidity Indicator Cards also called humidity card, moisture-proof label. It is a card used to show the humidity of the sealing space, it is an environmental measurement product that detects the relative humidity of the sealed package. The percentage data of the above or side of the circle is the relative humidity data for the circle indicator.


HIC


Humidity indicator card is divided into two types, One is humidity indicator card with cobalt, another one is humidity indicator card without cobalt. The principle of discoloration is as follows:

HIC 2

HIC with cobalt’s color-change principle is according to the principle of color discoloration after chlorinated cobalt absorbs water, [Co(H20)4Cl2] is blue [Co(H2O)6]2+is pink,HIC is blue [Co(H20)4Cl2] when drying, After absorber water is changed from blue to pink [Co(H2O)6]2+. If the color of the circle changes from blue to pink, it means that humidity in the packaging is achieved or exceeded the relative humidity value of the circle. It is also important to note that HIC with cobalt is not eco-friendly and not meet the EU's latest export standards.

HIC 3

Cobalt free HIC not contain cobalt chloride, discoloration uses other more environmentally friendly chemical substances (trade secret, it is difficult to specify the specific substance in detail); There are several kinds, such as blue change to pink, blue change to purple, yellow change to green, yellow change to blue, brown change to blue, brown change to green. Also, if the color of the circle changes from dry color to wet color, it means that humidity in the packaging is achieved or exceeded the relative humidity value of the circle. The cobalt free HIC is an ECO-friendly product, meets the EU's latest export standards.


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