Oxygen Absorbers once exposed to oxygen will immediately start to oxidise, capturing the surrounding oxygen. This activation period can last between 4 hours to 24 hours. Once the absorber has completely oxidised, the absorber is no longer working. This might sound like a problem, however bear in mind that the role of the absorber is to remove oxygen within your sealed package. Should that package remain sealed, then the conditions within the package will remain oxygen-free. Re-open a package and you will be exposing the contents to oxygen. In this case, the original absorbers should be discarded and replaced with new oxygen absorbers. There are a couple of variables to consider: • How permeable is your packaging? A high barrier packaging solution such as mylar will ensure that oxygen does not pass through to package contents. The lower the permeability of the packaging material (e.g. paper bag), the more often oxygen absorbers will need to be replaced. • Oxygen absorbers once fully loaded or ‘spoiled’ no longer have the capacity to absorb additional oxygen. It’s important to therefore make sure that you ‘round up’ when calculating your oxygen absorber needs. Underestimating your oxygen absorber needs will leave a portion of oxygen within your package causing contents to deteriorate faster over time.
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