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Comparison of hygroscopic properties of various desiccants

Release time:

2021-09-15

Common desiccants on the market now include silica gel desiccant, mineral desiccant, quicklime desiccant, calcium chloride desiccant, alumina desiccant, etc. What is the moisture absorption rate of each desiccant?

Silica gel desiccant: transparent particles also have colored silica gel desiccant, which is specially treated. It is also known as discolored silica gel desiccant. In fact, discolored silica gel desiccant is not allowed to be used in the EU region. Because it contains carcinogenic substances, the moisture absorption rate of high-quality silica gel is about 20%~37% under normal temperature and humidity environment. The small particles or whether they are round or very broken are relatively cheap but of poor quality. What the market sees is generally The moisture absorption of small particles of second-hand silica gel desiccant is generally not more than 10%, which can be ignored

Mineral desiccant: also known as montmorillonite, the moisture absorption rate of montmorillonite mineral desiccant is about 18% - 25% under the normal temperature and humidity environment. The moisture absorption rate is the same as that of high-quality silica gel, but the price is much cheaper than that of silica gel. It is also a natural mineral, non-toxic, harmless, and biodegradable. It is a kind of environment-friendly desiccant

Calcium chloride desiccant: among all desiccants, the desiccant with the strongest hygroscopic effect and the most continuous hygroscopic performance. Its hygroscopic rate is generally 8-15 times that of silica gel, and its hygroscopic capacity in marine containers can reach more than 300%. Therefore, it is often used for moisture-proof of marine container containers. After all, the sea environment is seriously humid due to the large temperature difference between day and night. Professional calcium chloride desiccant manufacturers have better moisture absorption effect. 

Quicklime desiccant: that is, calcium oxide desiccant is relatively common, and its price is also very cheap. However, it is dangerous in the transportation category because it will emit a lot of heat after moisture absorption. Many news reports have reported that the use of this kind of desiccant is not allowed. Quicklime desiccant has a better moisture-proof effect than ordinary silica gel desiccant

Aluminum oxide desiccant: molecular sieve desiccant has a moisture absorption rate of about 25% in ordinary environment, which is about the same as mineral silica gel, but its price is much higher than mineral silica gel, and its performance-price ratio is not high. Generally, it is used according to special requirements. 

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