Desiccants are materials with the capacity to adsorb water vapor from the air.
They are are useful in controlling moisture within a sealed package to prevent damage caused by moisture. Desiccants are packed in packets and bags of various sizes for convenient use in product packaging. Desiccants work like sponge that attracts water vapor into its tiny holes called capillaries. At low humidity conditions, only the smallest holes will be filled with water vapor. As humidity increases, the larger holes will begin to fill.