When to Replace Desiccants in Shipping Containers

Desiccants are a crucial component in protecting cargo during shipping by absorbing moisture from the air and reducing the dew point temperature or condensation point, thereby reducing the probability of 'Container Rain.' However, desiccants have a limited lifespan and must be replaced periodically to ensure continued effectiveness.

The frequency of desiccant replacement depends on several factors, including the type of desiccant used, the length of the shipping journey, the type of cargo being shipped, and the humidity levels in the shipping container.

For example, calcium chloride-based cargo desiccants, such as Clariant's CONTAINER DRI® II, have a high absorption capacity and are effective for longer periods, making them ideal for longer shipping journeys. On the other hand, silica gel desiccants may need to be replaced more frequently, especially if the humidity levels in the shipping container are high.

It is recommended to replace desiccants every 30-60 days, depending on the factors mentioned above. However, it is important to monitor the effectiveness of the desiccants regularly and replace them as needed.

One way to monitor the effectiveness of desiccants is to use humidity indicator cards, which change color to indicate the humidity levels in the shipping container. If the card shows high humidity levels, it may be time to replace the desiccants.

In summary, desiccants are an essential component in protecting cargo during shipping, but they have a limited lifespan and must be replaced periodically. The frequency of replacement depends on several factors, and it is important to monitor the effectiveness of the desiccants regularly to ensure continued protection of the cargo.