Desiccant applied to prevent the equipment, instruments, electrical equipment, pharmaceuticals, food, textiles and other various packaging items damp, at sea en route desiccant is also widely used, because the goods during transport often large and moisture deterioration due to zeolite 13x temperature, dry agents can effectively dehumidification moisture, so that the quality of the goods are protected.
A desiccant to absorb moisture from the atmosphere, in addition to a liquid, its drying principle is physically adsorbed water molecules in the structure itself, or the absorption of water molecules activated zeolite powder 5a  through chemical means, and changes its chemical structure, into another substances.
Common desiccants are lime desiccant chemisorption, magnesium chloride, calcium chloride, phosphorous pentoxide, or soda lime, silicic acid, which are chemically absorb water molecules and change its chemical structure into another material.