How do Humidity Indicator Cards work?

Humidity Indicator Cards (HIC’s) are used to determine when products have been exposed to moisture above recommended storage levels. They are a low-cost method of indicating humidity conditions inside a moisture barrier bag after vacuum packaging. Each Humidity Indicator Card is printed with moisture sensitive spots, which respond to various levels of humidity with a visible colour change from blue to pink. The humidity inside dry packed moisture / metallised barrier bags can be monitored by including a HIC inside. When the bag is opened, the card can be examined for proper dryness inside the bag. This indicates that the barrier bag and the desiccants are functioned correctly.

In order to constantly verify that dry packaging methods are not compromised during storage and transport of products, Humidity Indicator Cards allow users along the supply chain to monitor the packages conditions. The cards are reversible and change as conditions change in the packaging environment, allowing users to monitor the conditions of product packaging.

How Do Humidity Indicator Cards Work?

Humidity Indicator Cards generally range from one spot to six spot cards. Our Standard Humidity Indicator Cards and Cobalt Dichloride Free Humidity Indicator Cards are available in three spot, four spot and six spot.

3 Spot	4 Spot	6 Spot
The indicator spots on the HICs change colour from blue to pink as humidity increases and from pink to blue as humidity decreases.	The indicator spots on the HICs change colour from blue to pink as humidity increases and from pink to blue as humidity decreases.	The indicator spots on the HICs change colour from blue to pink as humidity increases and from pink to blue as humidity decreases.