Desiccant papers help prevent moisture from building up on materials in closed environments such as sealed packaging. Desiccant paper is received in an unactivated state. Once activated through a heating process, the desiccant paper absorbs the water molecules and traps them in the paper. When packaging containing desiccant paper comes in contact with moist air or liquids in its surrounding, the liquid will be drawn into the activated material. That is how desiccant sheets are able to keep metalized products from rust and corrosion.