Can You Put a Thermos Flask In The Refrigerator

Can You Put a Thermos Flask In The Refrigerator?

Insulated thermos flasks are excellent for storing hold or cold drinks and meals for hours without quickly losing the temperature. For example, you can keep hot meals in a thermos for about 4-6 hours, while ice can stay frozen for up to 24 hours. This is because thermos flasks are designed with ingenious technology that helps maintain temperature. Thermos flasks are built with stainless steel, while others are made with glass or ceramic and a stainless steel exterior.

Since they are designed specifically for retaining hot or cold temperatures, there’s always some curiosity about their functions. For example, can you put a thermos in the refrigerator? Can a fridge damage a thermos flask? So, if you’re looking for answers to these questions, please keep reading.

This article provides straightforward answers to your questions about keeping a thermos in a fridge. It also offers other interesting information about using a thermos flask that you might appreciate. So, let’s get to the answers!

Can You Put a Thermos Flask In A Refrigerator?

Yes, you can. It is completely safe to put a thermos flask in your refrigerator. You don’t have to worry about the cold ruining your flask. Thermos flasks are designed to withstand hot and cold temperatures, so they would be right at home in the fridge. Since thermos flasks have vacuum insulation, the contents of your flask will cool very slowly. However, if it’s a cold drink, it will remain cold for a while longer.

People get worried about keeping their thermos flask in the fridge because brands and retailers advise them not to put it in a freezer. However, there’s no problem with your flask chilling out in your fridge.

Can You Put a Thermos Flask In a Freezer?

The simple answer is no. You cannot put a thermos flask in your freezer. This is because liquid expands and takes up more space as it gets cooler. This expansion process can shatter glass or bend the stainless steel in the flasks. If there’s any damage to your thermos flask, it may fail to insulate properly, or it could start leaking. Also, your thermos could start losing temperature quickly if the vacuum insulation gets filled with air. However it is possible to freeze your thermos, but it is very risky, and we advise against it.

Will The Contents of Your Thermos Get Cold in The Fridge?

Since thermoses can keep ice frozen for more than 24 hours, some people think that keeping one in the fridge will make it colder or help the temperature last longer. However, it might not be so useful.

A thermos flask can keep drinks cold or ice frozen because of its design. They have double walls with a layer of vacuum installation between the inner and outer body of the task. This design makes it a lot harder for heat to pass through the flask’s body.

So, instead of your drinks getting colder in the freezer, it slows down the time it takes for cold beverages to get warmer. As a matter of fact, only the body of your thermos gets colder. So, if you want the contents to get cooler, you’ll need to take the lid off the flask.

Can You Freeze an Empty Thermos?

You have nothing to worry about if you want to pre-chill your empty thermos flask. This won’t break any glass or bend stainless steel because there will be no liquid content in the flask that can expand.

As we’ve mentioned, thermos can handle freezing temperatures. This means an empty one will do just fine. However, you can use a thermos to store frozen contents like ice cubes and ice cream.

Why Can’t You Freeze a Thermos?

While there’s no official warning from Thermos against putting an insulated flask in the freezer, there are other manufacturers and experts that strongly advise against it. This is because a freezer can turn your drinks against you.

When liquids are frozen, they expand and fill up more space. This freezing and expansion process can deform and misshapen the flask. Also, as the liquid expands, it could break the seals keeping things together. This can make your flask lose its insulating ability, and your cold drinks will get warmer quickly.

Will You Void Your Warranty If You Put Your Thermos In a Refrigerator?

Warranty vector stamp

No, you won’t. Depending on where you purchased your thermos flask, they usually have a 5-year warranty for the stainless steel vacuum wear and a 1-year warranty for the glass. Unfortunately, although this warranty covers company defects, its protection doesn’t extend to personal damage.

So, since your thermos cannot get damaged when you put it in the fridge, you have nothing to worry about. However, if you decide to keep the flask in your freezer, your warranty could be threatened.

As we mentioned, frozen liquids expand and take up space. However, in a thermos flask, there is little or no room for the liquid to expand. This is why it can break your thermos or affect its insulation. If that’s the case, your warranty will be void. So, you’ll have to pay for the cost of repair or replacement and shipment.

Why Would You Want To Freeze Your Thermos?

There is a long list of why people may want to freeze their thermos. For example, you may want to freeze your drink for later or freeze some water to become ice. Also, some people believe in freezing the thermos to pre-chill it so that liquids can remain cold for longer.

However, the idea of pre-chilling barely holds any grounds. This is because the process doesn’t make much of a difference. Thermoses are designed with a thick insulated vacuum between the inner and outer walls of the thermos. So, it is nearly impossible for the cold temperature on the outside body to make it to the inside. So, rather than pre-chilling to keep drinks colder longer, it only makes the exterior colder to touch.

Will The Taste of My Drinks Change If I Put My Thermos in a Refrigerator?

It’s always annoying to discover that something you kept in your fridge has lost its taste, or it now tastes like a combination of other items in your fridge. However, you don’t have to worry about that when using a thermos flask to store your drinks in a refrigerator. Thermoses are designed to be airtight. So, the only way the taste of your drink can be affected is if the lid isn’t closed correctly before it is placed in the fridge.

Final Thoughts

Thermoses are useful for our daily activities. They help you store hot or cold content while maintaining their temperatures for as long as possible. With many drinks and foods stored in a thermos, you may sometimes want to put them in the fridge. However, is that a safe thing to do?

Thankfully, you should have no problems keeping your thermos flask in your refrigerator. However, you need to ensure that you don’t try to freeze the flask in a freezer with liquid inside. We hope that this article has answered all your questions clearly, and helped you understand how you can use your thermos more safely.

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