Silica gel is a hard granular desiccant, 6-16 mesh. It has the appearance of crushed glass, is odorless and insoluble. Its strong affinity for water gives it an adsorption capacity of over 40% of its own weight at 100% relative humidity.
Silica gel prevents mold and mildew, and is essential for collection maintenance and storage in humid environments. It can be reused after being fully saturated with water. To reactivate, simply heat at 250°F for approximately eight hours. Packed in air tight metal cans with friction lids.
For related products, see also #1194C indicating silica gel, #1195A desiccant packets, #1193 dehumidifier, and #1195C humidity indicator cards.