Humidity Sponges™ meet all drying requirements. The latest in drying technology turns any container into a desiccator. Indicator bag particles show when moisture capacity has been reached. Humidity Sponges™ meet FDA (Food and Drug Administration) requirements for use in direct contact with food and drugs. Desiccant (sodium calcium aluminosilicate hydrate) is nontoxic and is a GRAS (Generally Recognized as Safe) material. It is ideal for storing food/pharmaceutical samples, electronics, PC boards, optics, chemicals, and equipment.