Introduction
You’ve poured countless hours of effort into developing your product and carefully selected its packaging. Now it’s time for the final step: long-term storage. You know you need oxygen absorbers (often referred to as deoxidizers) to prevent spoilage, mold, and lipid oxidation.
But when you’re standing in front of a 500cc box of absorbers and a 2000cc bag of absorbers, a classic moment of anxiety sets in:
“If I use too little, will my product go bad within a month?”
“If I use too much, will I be wasting money? Or will it have some strange effect on the packaging?”
It’s like “Goldilocks” searching for the perfect porridge—you need to find the “just right” amount. In this article, we’ll demystify calculating the right amount of oxygen absorbers, helping you stop guessing and start protecting your products scientifically.
2.Why Is “Too Much” or “Too Little” a Problem?
When using oxygen absorbers, understanding the risks is crucial.
2.1 Using “Too Few”: The Start of a Disaster
If the oxygen absorber’s capacity isn’t sufficient to remove all the oxygen from the container, the remaining oxygen will continue to do its work. Aerobic bacteria, mold, and insect larvae can still survive. High-fat foods (such as nuts) will continue to oxidize and develop a rancid taste. Simply put: Your product won’t reach its expected shelf life.
2.2 Using “Too Many”: Waste and Potential Deformation
The good news is that using too many oxygen absorbers generally does not compromise food safety (as long as they are food-grade). The bad news is that it’s a waste of money. You don’t need to use a sledgehammer to crack a nut.
Note: In certain flexible packaging (such as thin Mylar bags), an excessive amount of oxygen absorbers may create too much suction as they absorb oxygen, causing the packaging to shrink excessively and appear wrinkled, which affects shelf appeal. This is known as the “paneling effect.”
3.Finding Your “Magic Number”: A Calculation Guide
This is the most critical part. Don’t worry—you don’t need a degree in advanced math. We just need to determine two variables: the container volume and the headspace.
Step 1: Determine the Total Container Volume
How much water would your jar or bag hold if filled to the brim? This is its total volume, typically measured in milliliters (ml) or cubic centimeters (cc).
For example: A standard 1-quart Mason jar holds approximately 946 cc.
A 1-gallon Mylar bag is approximately 3,785 cc.
Step 2: Estimate the “Void Space” Factor
This is where most people make a mistake. You’re not absorbing oxygen for the entire container; you’re only absorbing oxygen for the air space not occupied by the product.
If you’re packing flour or powdered sugar, they pack very tightly, leaving very little air (the void space ratio may be only 30%–40%).
If you’re packing pasta, large nuts, or freeze-dried foods, there are large gaps between them (the void space ratio may be as high as 60%–70%).
Step 3: The Formula
The formula for calculating the minimum number of cc required is as follows:
(Total container volume in cc) × (void-space percentage) × 0.21 = minimum oxygen absorber capacity in cc
For example:
You have a 1,000-cc bag filled with large pieces of pasta (estimated to have a high porosity, with about 70% being air).
1,000 cc (total volume) × 0.70 (void ratio) = 700 cc of air to be treated
700 cc (air) × 0.21 (oxygen content) = 147 cc
Conclusion:
You need at least a 150cc oxygen absorber. Using a 200cc or 300cc one would be safer.
4.The “Cheat Sheet” Approach
Don’t feel like doing math? Here’s a rule of thumb that applies across the industry: it’s better to err on the side of a little more than a little less. Rounding up is the smart move.
Here are some conservative recommendations for common container sizes (assuming an average void ratio):
| Container Size | Recommended Absorber Size |
|---|---|
| Pint Jar / Small Pouch (approx. 500cc) | 100cc – 200cc |
| Quart Jar / 1 Liter Mylar Bag (approx. 1000cc) | 300cc |
| 1 Gallon Mylar Bag (approx. 3.8 Liters) | 500cc – 1000cc (depending on content density) |
| 5 Gallon Bucket (approx. 19 Liters) | 2000cc – 3000cc |
Expert Tip: If you are storing extremely loose items (such as freeze-dried marshmallows), use the higher values in the table. For extremely dense items (such as fine salt), you can use the lower values.
5.Final Essential Tips
Even with correct calculations, operational errors can lead to failure.
5.1 Speed is key
Oxygen absorbers begin working as soon as they come into contact with air. Try to complete the process—from opening the original packaging to sealing the absorbers inside your product—within 15–30 minutes.
5.2 The Seal Must Be Perfect
If your bag leaks, even the largest oxygen absorber will be ineffective. It will continue to absorb oxygen from the outside until it is completely depleted. Make sure your heat seal is perfect.
5.3 Store Unused Oxygen Absorbers Properly
Do not leave the remaining half open in the original bag. Immediately transfer unused oxygen absorbers to a small airtight jar or a vacuum-sealable bag, and remove as much air as practical.
6.Conclusion
Choosing the right oxygen absorber for your product doesn’t have to be a guess. By knowing the size of your container and the density of your product, you can confidently select the “just right” dosage. This not only ensures the long-term safety of your product but also helps you avoid unnecessary costs.
Ready to get started on your long-term storage project?
Browse our oxygen absorber lineup to find the specifications that best suit your needs. If you’re still unsure, feel free to contact our team of experts!
