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World Leading Cargo Moisture Control

According to insurers, approximately 10% of goods shipped worldwide are damaged in transit by "container rain" caused by humidity and temperature changes. The effects of container rain are costly, resulting in expensive returns, replacements and dissatisfied customers - but thanks to our expertise in moisture control, we’ve developed some of the industry’s leading solutions for preventing and controlling container rain.

Our cargo moisture control solutions last up to 12 weeks

Created by our team of experts, BirchSorb hyperdesiccant™ is designed to last for up to 12 weeks, absorbing three times its own weight in moisture - with no opportunity for moisture to re-release, even in hot environments.

More effective than Silica Gel, Desiccated Clay or Calcium Chloride BirchSorb is Reach and CLP compliant, safe to handle and can be disposed of with normal waste, making it efficient and effective.

Cargo moisture control solutions
Formulation and product advice

Our experts are available for product selection and advice

Our experts on hand to help to provide guidance specific to your moisture control needs - and alongside our tailored solutions, we can also assist with technical support and more.

Container Rain - The Problem

Fluctuation in temperature and relative humidity (RH) within a shipping container or other enclosed transport system (lorry etc.) causes the condensation of moisture which can damage cargo. This is a phenomenon known as container rain.

Container rain is a complex mechanism, which depends upon many factors, including transit route, time of year and cargo packaging (cardboard and wood can absorb moisture and regulate atmospheric humidity).

There are three distinct phases to RH in container shipping.

Phase 1

Loading and handling before sailing

Phase 2

Time at sea

Phase 3

Delivery and offloading at the destination

Container rain is more likely to occur in phase one and three, as this is where the largest changes in RH and consequently, the formation of condensation occur.

Typical temperature / RH profile for a shipping container, showing clearly the difference between the three phases.

In deep-sea routes, transit time can be over nine weeks, which can include additional time during a transfer at a hub port and an extra period of RH fluctuation.

Global Delivery

Of All Our Products

Our unique formulation absorbs humidity from inside the container or packages and locks it away chemically in a solid matrix. Empirical evidence shows the blend of multiple active ingredients plus sophisticated packaging ensures exceptional moisture control in all three phases of the journey:-

Phase 1

Fast-acting components absorb moisture and begin to set in a solid matrix.

Phase 2

Moisture is chemically bound in an exchange between fast and slow-acting components and won’t release moisture back into the atmosphere.

Phase 3

Further moisture absorption capacity is realised as a result of the slow acting components and gives BirchSorb its extended life.

Birchsorb V Calcium Chloride Effective Performance

BirchSorb can be used in shipping containers or any sealed freight container, such as trailers or boxes. Any cargo or packaging which could be adversely affected by humidity and container rain.

Packaging pouches


Steel shipping



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