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Desiccants for containers deeply absorb moisture, keeping the contained materials dry and safe. They come in different types, each having a unique function.
This is a porous, granular, crystalline form of silicon dioxide. This is by far the most common container desiccant material used for dry packaging. With a moisture absorption capacity of about 20%, silica gel is usually found in small packets in products to keep them dry. The gel also features tiny pores that enhance its surface area for moisture capture. However, it cannot be reused or regenerated once saturated.
These are natural, naturally occurring red or gray clays, ground and shaped into small granules. They work by absorbing moisture from the air and are effective at lower humidity levels. They, however, have less absorption capacity than silica gel (around 15%). Unlike silica gel, they can sometimes be regenerated by heating them in an oven to release the absorbed moisture. Clay packets are cheaper than silica gel packets.
It is made from carbonized sources like coconut shells, peat, or bamboo, and comes in powder or granule form. While it mainly absorbs chemicals, odors, and pollutants, activated carbon can absorb some moisture because of its moderate surface area. This is typically about 15% moisture absorption capacity. The desiccant can be regenerated by heating it to release the absorbed chemicals.
This is a white, transparent, or opaque crystalline solid that looks like salt. It absorbs moisture and forms a liquid brine, thus reducing the humidity in containerized spaces. Its moisture absorption capacity is about 30%. This high capacity keeps it constantly regenerating and effective as a container desiccant. It is powerful, but users must ensure the containers do not become completely saturated, as this can lead to corrosion.
These come in the form of white beads containing polymer crystals. They are specifically designed for high capacity and efficiency in absorbing moisture from shipping containers. With up to 30% capacity, the crystals feature a unique polymer formulation that promotes effective moisture absorption. It can be reused several times and last up to one year when used correctly.
Once acquired, one should know how to use them correctly for optimal performance and container safety.
After sealing the container with the goods, place the desiccant bags on top of the stacked goods. That way, they are situated properly, so they absorb any moisture accumulating on top of the items. The desiccants then work by capturing the moisture in the air before it can settle on the products. For large containers and long-distance transport, it is recommended to use more than one bag or packet to effectively regulate humidity throughout the space.
After putting the desiccant bags inside the container, seal the container door properly. Ensure all sealing elements such as bolts, hinges, gaskets, seals, and door seams are tightly secured. The internal pressure then balanced with the external pressure, reduces the possibility of air exchange between the atmosphere and inside the container. This pressure will form an airtight seal that helps maintain the dry condition created by the drying agent for containers.
Certain container desiccants work better when certain products are transported. Silica gels, for instance, are usually perfect for electronics, leather goods, and pharmaceuticals. These are due to its high moisture absorption capacity and durability. Clay is ideal for cheaper goods such as textiles, furniture, or non-electronic products. Its lower cost provides an effective solution for keeping moisture at bay.
Desiccant bags are usually most effective when placed in sufficient number to cover the cargo during transport. A good rule of thumb is about one pound of desiccant for every 1000 cubic feet of container space. Complex cargo may require more bags so the entire space is effectively saturated with the desiccants. Calculate the volume of the container and divide this by the volume of one moisture absorbent bag to get the number of bags needed.
While container desiccants are similar in function, several factors make each type ideal for certain products. Buyers should thus consider the following factors when purchasing them in bulk.
The container size will affect how much desiccant is required to dry it. Smaller containers can do with fewer packets, while the larger ones will need more for effective moisture control. Buyers should consider the standard containers they supply their clients before investing in desiccants in bulk. This will help them stock the right quantity and size of desiccants to meet client needs during transport.
As seen above, each desiccant bag material has moisture absorption strengths and weaknesses. Activated carbon, for instance, is ideal for perishable goods due to its ability to absorb odors. Silica gel, on the other hand, is best for electronics and leather products due to its high absorption capacity. Buyers should understand what products each container desiccant is best suited for before purchase.
Desiccants come with different price ranges, largely determined by the material used and efficiency. Calcium chloride, for instance, may cost more than clay because of its higher absorption capacity. Activated carbon is typically more expensive than silica gel. Clients usually have preferred desiccant type budgets, so buyers should stock that kind of desiccant.
It is important to ensure safety especially when transporting food, drugs, and other sensitive goods. Silica gel and activated carbon are usually preferred for these products as they do not release any dampness into the air. Clay desiccants, however, while effective, may contain some traces of chemicals that can contaminate food products. Buyers should ensure they stock safe and suitable container silica gel packets for sensitive products.
Some container desiccants, such as silica gels and clay, can be used only once. Others, like calcium chloride and imperial desiccants, can be reused several times. Reusable desiccants make a more cost-effective and eco-friendly solution. Clients may want a cost-cutting measure that allows them to use the desiccants several times under different containers. Buyers should consider what type the clients prefer and stock only that.
Caring for container desiccants ensures they can be reused as many times as possible while still being effective at moisture absorption. The kind of storage and maintenance tips to follow depend on the type of desiccant. Here are some general care tips to follow, plus specific care instructions for different types.
Keep the desiccants dry and away from direct sunlight to avoid premature saturation and degradation. Clean them every time after removing them from the container and before the next use. Inspect them regularly for any signs of damage or saturation. Silica gels, for instance, can turn blue from dry to pink when full of moisture. Finally, store them in airtight bags or containers to prevent dust accumulation.
They require little to no maintenance apart from a little care. They should be regenerated or dried after use to restore their moisture absorption capacity. This can be done by placing the silica gel packets in an oven set to 200 degrees Fahrenheit. Leave them for about 2 hours or until the blue crystals return to their original white color. Store them in a cool, dry place until the next use. Do not expose them to moisture while storing them.
Like silica gel, clay desiccants should also be regenerated after use. This is usually done by exposing them to sunlight for several hours. The sun will heat the desiccants and release the absorbed moisture back into the environment. Store the desiccant in breathable jute bags to prevent dust accumulation and keep it dry.
This desiccant requires more careful regeneration than silica gel and clay. Expose it to low heat or sunlight for several hours. Keep in mind that strong heat can degrade the carbon and reduce its effectiveness. It is recommended to use an oven at a low temperature (175 degrees Fahrenheit). Store it in airtight containers to prevent it from absorbing moisture or odors from the air.
This is a highly effective but challenging desiccant to maintain. Store it in dry conditions to prevent saturation, but it can’t be easily regenerated like silica gel. The best way to keep it effective is to use it continuously or replace it frequently. Only discard it when fully saturated with moisture to form a brine solution. Consider using a brine container to stop it from becoming over-saturated within products.
Store the desiccant beads in airtight containers to prevent them from absorbing moisture. Regenerate them by exposing them to sunlight or placing them in an oven at a low temperature to release the absorbed moisture. Consider using a dehumidifier as well to maintain their effectiveness.
A1. Yes, there are various sustainable options available today. Biobased silica gel is made from renewable sources like rice husks. This makes it a more eco-friendly option. Natural clay desiccants also come from abundant and renewable mineral sources, reducing the carbon footprint. They’re also biodegradable, so they won’t harm the earth once disposed of. Another option are moisture absorbers for shipping containers, such as calcium carbonate or magnesium oxide. They’re both renewable and biodegradable.
A2. Yes. Container drys are specifically designed to control humidity in enclosed spaces for long periods. They are often used for goods that need to stay dry, such as electronics, textiles, and agricultural products. Just ensure they are correctly calculated according to the size of the shipping container. Choose the right type according to the client’s cargo and ensure they remain effective till the destination is reached.
A3. Most desiccants have no fixed expiration. Some, however, become less effective with time. Examples include activated carbon or calcium chloride. They tend to absorb moisture from the air consistently, even while in storage. This can sometimes reduce their absorption capacity. Periodically check and regenerate them as instructed above. Store them in airtight containers to keep them dry until use.
A4. Yes. Many desiccants can be reused after proper regeneration. Make sure to regenerate them according to the type’s requirements. For instance, silica gel packets can be reused several times. Clay desiccants require sunlight exposure for a few hours to release the absorbed moisture. Be sure to store them in dry, airtight containers between uses to extend their lifespan.
A5. Yes. Container desiccants like silica gel and clay are safe for food products. They’re effective at controlling moisture and preventing mold and spoilage. They maintain a dry environment within the container, preserving freshness. Spore desiccants are ideal for perishable goods because they create a dry environment that inhibits the growth of mold, bacteria, and other pathogens.
