When an oxygen absorber is removed from its protective packaging, the moisture in the surrounding atmosphere begins to permeate into the iron particles inside of the absorber sachet. Moisture activates the iron, and it oxidizes to form iron oxide. As oxygen is consumed to form iron oxide the level of oxygen in the surrounding atmosphere is reduced. Absorber technology of this type may reduce the oxygen level in the surrounding atmosphere to below 0.01%.
There are different kinds of oxygen absorbers. Ours are ZPT and are formulated for use for general products. It is okay to use desiccant and silica gel products along with the ZPT Ageless with products such as that inside time capsules.