A desiccant is a hygroscopic substance that absorbs or removes moisture from the surrounding environment in order to maintain a dry condition. Hygroscopic materials attract and hold water molecules from the air or other substances, which allows desiccants to reduce humidity and prevent moisture-related damage.
Desiccants are essentially the opposite of humectants, which retain moisture. In most practical uses, desiccants are solid materials placed in packaging, containers, or industrial systems where moisture control is necessary. Their primary function is to absorb water vapor and help maintain a stable and dry microenvironment.
Desiccants are widely used in industries such as packaging, petrochemical processing, pharmaceuticals, food storage, electronics manufacturing, and logistics.