Silica Gel is a form of silica manufactured from sodium silicate and sulfuric acid. Silica Gel is non-hazardous and is capable of adsorbing 40% of its weight in water vapor at 100% humidity. Silica Gel has a porous molecular structure that closely resembles a sponge, and has the highest capacity of any commercial desiccant for moisture adsorption. Used in a wide variety of applications such as: Rolled Steel, computers, aerospace, automobile parts, military equipment, crates, etc.Available in 1/6, 1/3, 1/2, 1, 2, 4, 6, 8, 16 or 80 unit paks.Desiccant Materials: Silica Gel, Indicating Silica Gel, Clay, Molecular Sieve and Carbon.Available Substrates: Tyvek (1/6-16 unit - FDA Approved), Kraft (1/6-4 unit) and Sewn Bag (8-80"unit).Packaged in 5 gallon pails (1/6-2 "unit") or 30 gallon drums (1-80"unit).