Our container desiccants are primarily divided into two categories: Calcium Chloride Container Desiccant and Magnesium Chloride Container Desiccant.

• Calcium Chloride Container Desiccant is mainly composed of calcium chloride and plant starch. It works by leveraging the strong hygroscopicity of calcium chloride to absorb moisture from the air. After absorption, the moisture combines with the starch to form a gel, effectively preventing liquid leakage. Under conditions of 50°C and 95% relative humidity (RH), its moisture absorption rate can reach up to 300% within 30 days.
• Magnesium Chloride Container Desiccant is primarily made from magnesium chloride and a polymer absorbent material. It powerfully absorbs moisture from the packaged environment and gradually hardens into a solid after absorption, preventing moisture reverse permeation. Under conditions of 50°C and 95% relative humidity (RH), its moisture absorption rate can reach up to 400% within 30 days.

Why Use Container Desiccant?
During transportation, the temperature inside a container rises and falls with the day-night cycle, causing the relative humidity inside to fluctuate. This ultimately leads to two common issues: “Container Rain” and “Cargo Sweat” Container desiccants are specifically designed to address these problems by absorbing excess moisture inside the container, thereby preventing condensation.

Container Rain: Occurs when a container moves from a high-temperature zone to a low-temperature zone, causing the internal temperature to drop below the dew point. Water vapor then condenses into droplets that accumulate on the container’s ceiling and walls, eventually dripping onto the cargo.

Cargo Sweat: Occurs when cargo is transported from a cold region to a warm region, or when its storage environment changes from cold to hot. Moisture in the air condenses on the cold surface of the cargo or its packaging, forming water droplets.

What Type of Container Desiccants Can Meet the Needs of Sea Cargo Shipping?

There is no single “best” desiccant—each type has its own strengths, limitations, and ideal applications. Compared to traditional clay and silica gel desiccants, calcium chloride(or magnesium chloride) offers a higher moisture absorption rate and a broader effective temperature range. This makes it especially suitable for demanding environments with high humidity levels or harsh conditions.

• Calcium Chloride Anhydrous Desiccant: Moisture Absorption Rate: ≥300%, Temperature Range: -5°C to 90°C.
• Clay & Calcium Chloride Blend Desiccant: Moisture Absorption Rate: ≤85%, Temperature Range: <50°C.
• Clay Desiccant / Silica Gel Desiccant: Moisture Absorption Rate: ≤30%, Temperature Range: <50°C (Clay), <37°C (Silica Gel).

• Magnesium Chloride Desiccant: Absorption Rate ≥ 400%, Temp. Range: -35°C to 95°C
• Clay/Calcium Chloride Blend: Absorption Rate ≤ 85%, Temp. Range: < 50°C
• Clay Desiccant / Silica Gel: Absorption Rate: ≤ 30%, Temp. Range: < 50°C (Clay) / < 37°C (Silica Gel)