A Consumer Council test has shown dehumidifying agents with calcium chloride to be more effective in moisture absorbency.
They were found to fare better in dehumidifying capacity in comparison to those containing silica gel, bamboo charcoal or activated charcoal.
Included in the test were 20 models of dehumidifying agents comprising 8 tank type, 3 strip type and 9 bag type. Most models had calcium chloride as the main ingredient.
The models were put to test for moisture removal capacity at constant environmental conditions of 25℃ and relative humidity 80% for a total of 80 days.
The test showed clearly that the calcium chloride type performed far better than the non calcium chloride type using silica gel, bamboo charcoal or activated charcoal. Charcoal is generally used to absorb odour.
The results on moisture removal capacity revealed variations among the different types: tank type (from 236 ml to 508 ml), strip type (268 ml to 428 ml), calcium chloride bag type (90 to 335 ml), non calcium chloride bag type (3 to 44 ml).
Consumers are advised to choose the different types of dehumidifying agent according to their applications and requirements.
For example, in large closets and wardrobes, tanks may be selected for their larger dehumidifying capacity. In tight space the strip type is preferred, while the bag type can be placed inside the pockets of clothes or in drawers or small containers.
For best effect, consumers are advised to use dehumidifying agents in closed environment as air-tight as possible, and reduce the frequency and time of opening and closing.
The test examined problems related to leakage and moisture-proof of sample packages. Consumers can consult the test report in this August issue of CHOICE for details.
Parents are also warned of the potential hazard of accidental ingestion of dehumidifying agents which should be kept away from the reach of young children.
In the two years between July 2005 and July 2007, there were altogether 12 cases of desiccant ingestion reported by the Emergency Rooms of six hospitals, involving 2 cases of calcium chloride and 10 cases of silica gel.
Eight of the victims were children aged 5 years or below.
Manufacturers of food or products providing dehumidifying agents in their merchandise are urged to clearly label the ingredients and the package with the warning "Do Not Eat" to prevent accidental ingestion.
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