Moisture indicator cards are commonly used in semiconductor packaging to monitor the moisture level inside moisture barrier bags or other packaging materials. Moisture can be a major concern in semiconductor packaging, as it can cause corrosion and damage to sensitive electronic components and devices.
Moisture indicator cards are small, rectangular cards that are impregnated with a special chemical that changes color in response to changes in humidity. The cards are typically placed inside a moisture barrier bag along with the components or devices being packaged, and the color of the card is checked periodically to determine the moisture level inside the bag.
Moisture indicator cards are available in a range of sensitivities, which allows manufacturers to select a card that is appropriate for the specific moisture levels that are expected in their manufacturing environment. Cards are typically available in sensitivities ranging from 5% to 60% relative humidity.
Moisture indicator cards can be used to help ensure that components and devices are stored and transported in an environment that is safe from excessive moisture. If the card indicates that the moisture level inside the bag has exceeded a certain threshold, the components or devices should be removed from the bag and inspected for any signs of moisture damage.