Molecular Sieve is a manufactured crystalline version of Zeolite containing a network of uniform pores and empty cavities. Molecular Sieve is derived from sodium potassium or calcium alumina silicate. It is the most aggressive of the primary desiccants. Used in a wide variety of applications such as: Pharmaceutical, electronics, diagnostic kits, foods, clothing, powders, vitamins, consumer products, parts etc. FDA Approved Tyvek Bags, packaged in 10 gallon drums.