The Science Behind the OXO POP Container Airtight Seal
Words OXOWe dive into how the iconic push-button storage containers actually seal to keep food fresher, longer.
OXO POP Containers are our much-loved food storage solution that have found their way to millions of pantries, cupboards, restaurants—even classrooms and under bathroom sinks. We created our POP Containers to help keep pantry staples like flour, sugar, coffee beans and snacks fresher longer and to help keep clutter at bay. You might wonder how exactly the containers do that— the answer is in their airtight seal.
How a Refrigerator Door Inspired POP Containers
When investigating the science behind sealing, we immediately thought of a refrigerator. Walk by a refrigerator and you don’t feel cool air escaping. The door opens easily when you grab the handle; close the door and the refrigerator is sealed.
POP is no different. We designed an internal, patented web mechanism (go Behind the Design of the POP Containers to learn more) in the lid that causes the silicone seal to act like the seal around your refrigerator door. When you press the button, the web expands, pushing the seal, or gasket,out against the container walls, creating a barrier that prevents air from escaping.
Smoke does not escape from the container once it is sealed. We’re demonstrating this with a colored smoke bomb in a lab with a professional engineer. Do not attempt at home.
When you press the POP button, the web in the lid will expand or contract, depending on whether you’re closing or opening the container. When the web contracts, the seal is temporarily “broken” and air can start to escape.
How to Get the Proper Seal
The silicone gasket has a thin center “fin”. When engaged, the gasket expands, and the fin pushes against POP Container bodies to create an airtight seal.
The silicone “fin” seals against container walls when the button is pressed.
That silicone piece is flexible when it’s moved (like from wiggling the lid to open the container) it can temporarily break contact between the fin and the container walls. This allows air to come in and the lid to come off. That’s why we recommend grabbing the containers from the base instead of their lid and always using the button to release the seal.
Measuring Seal Consistency
We design our POP Containers to seal the same way, every time you use them.
OXO engineers carefully calibrate the internal web mechanism and the container – ensuring every web – and fin – expands flush against side of the container. Think back to the refrigerator analogy: we’re checking that the refrigerator door is the right size to close snugly into the refrigerator but also the right size to open easily.
In addition to conducting weight tests (putting different amounts of weight in POP Containers and turning them upside down to test the strength of the seal), we also test the POP Containers by filling them with pressurized air and measuring the amount of air that escapes. With a proper seal, no air escapes.
We conduct weight tests to test the strength of the lids.
Now that you know how POP Containers work, here’s a handy size guide that pairs pantry staples with their perfect POP partner.
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10 Comments
Will not seal. All three I bought will not push flush with container, my husband is strong & he cannot get them to push
Thermometer 1156960 battery “cap” is deformed at coin slot can I get replacement for “cap” or cover
Can you get a replacement lid
Alix Chan, thank you for your comment that led me to realize that one I bought at Marshals a year ago was the old style that the bottom of lid be raised so vacuum too!
I really liked the OLD design of the POP containers where the bottom part of the lid was also lifted up creating a vacuum, the current design probably also works but it’s easy to pull the lid off without popping it, in the old design it was practically impossible. Any chance we can get the old type containers anywhere?
I really like the Pop containers and I really appreciate the brown sugar keeper that attaches to the lid. However I am not as thrilled with the scoops designed for the POP containers. For one the plastic always seems oily no matter how many washings I give it. The second problem is the designed in grooves that allow it to be attached to the lid. While I initially thought this was a good idea I have come to hate these grooves. They trap flour, sugar or rice and tend to cause a mess while cooking. I do give you credit for thinking this up but having used it I am not sure it is necessary to attach the scoop to the lid.