When an oxygen absorber is removed from its protective packaging, the moisture in the surrounding
atmosphere begins to mingle with the iron particles inside of the Oxygen Absorber sachet. As the
oxygen molecules from the moisture interact with the iron (Fe) particles, rust begins to develop.
Typically, there must be at least 65% relative humidity in the surrounding atmosphere before the rusting
process can begin. To remedy this dilemma, sodium is added to the mixture. The sodium acts as a
catalyst, or activator, causing the iron powder to rust even with low relative humidity. With the
conversion of iron and oxygen into a single iron oxide substance, the presence of oxygen in the
surrounding atmosphere is dramatically reduced.
The performance of oxygen absorbers is affected by the ambient temperature and relative humidity Activated Carbon (C), also called activated charcoal or activated coal, is a highly porous substance that
allows gases to pass through and interact with the exposed carbon. As the gases interact with the
carbon, most impurities and contaminants are adsorbed and neutralized. As a result, the presence of
undesirable odors is greatly reduced.