Humidity indicator card, also known as humidity card, moisture proof label; It is a kind of environmental measurement product which is used to display the humidity condition in the sealed space and to detect whether the relative humidity in the sealed package is in the safe range.
Most of the electronic components, precision optical components and other high-end electronic and instrument equipment are prone to be affected by moisture, resulting in product corrosion, sensitivity reduction and even irreparable damage. In order to avoid the erosion and damage of the product by moisture, most products will use moisture-proof packaging combination, in the final product and semi-product packaging stage to protect the product, and the humidity display card is convenient and economic detection of humidity in the controlled range of materials, when opened the sealed bag, The color display of the humidity card read data can be used as the basis of monitoring whether the humidity in the sealed package is within the specified humidity range, and at the same time, it can also indirectly reflect whether the desiccant in the sealed package plays a hydophilic effect.
*2004/73/EC(Environmental Regulation of the European Union) * GJB2494-95 (Military Standard of the People’s Republic of China) * MIL-I-8835A(Military Packaging Standard of the United States) * JEDEC(Electronic Components Industry Association Standard)
1) Cobalt-containing humidity card (not in line with the latest EU export standards) : to intuitively judge the humidity condition from the color change. [Co(H20)4Cl2] is blue [Co(H2O)6]2+ is pink. When drying, the humidity card is blue. If the color in the circle changes from blue to pink, it means that the humidity in the package reaches or exceeds the relative humidity value corresponding to the circle.
2)Cobalt-free humidity indicator card does not contain cobalt dichloride, safe and environmentally friendly; It is a convenient and cheap safe method to detect environmental humidity. Users can quickly judge the humidity and desiccant effect of product packaging by the color on the card. If the humidity in the package exceeds or equals this value, the corresponding point on the card will change from dry color to hygroscopic color, according to which the effect of the desiccant can be easily known.
Humidity indicator card is a reversible change of humidity, humidity more than the corresponding humidity value, circles from dry to moisture absorption color color color, if the humidity is lower than the corresponding humidity value, has become the humidity of hygroscopic color card color can change back again dry, just from the moisture absorption color back to dry color takes longer, more need enough desiccant to keep humidity card color restore dry state.
Vacuum packaging for semiconductor, IC/integrated/circuit board (PCB), electronic components, sensitive components, organic materials, munitions, optical instruments, metal materials, composite materials, medicine, storage and all kinds of products.