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Can You Microwave Glass Jars? Often Nope, and Here’s the Fact!

One of the most dynamic and marvelous inventions that changed the realm of ingredients came in 1936 when a microwave was invented by a self-taught Engineer LeBron Spenser and his accomplice Robert Hall.


Eight decades later, microwaves are still spreading waves of the limelight from what they do; however, are they flexible to be used by all kitchen utensils, especially glass jars? 


Can you microwave glass jars, or it’s a disaster lurking in the kitchen waiting for a trigger?

Glass Jars and Microwaves

Glass jars are diversely used to pack various foods, from drinks to real desserts, and many kitchens have several of them! Is it safer to microwave food directly in it, or some precautions should be taken? Let’s sink to the bottom of a glass jar-microwave relationship;


Aozita 24 Pcs Glass Spice Jars/Bottles (recommended)

Ordinary Glass is Dangerous When Microwaved

Glass jars keep ready food waiting for microwaving to warm it; why don’t you put it in a microwave to get the job done? Don’t be tempted to do so because experts say it is not safe to microwave food in a glass jar.


Most jars dominating our kitchens are made of ordinary glass. Ordinary glass isn’t resistant to heat, so while microwaving, the heat buildup inside the jar causes a temperature fluctuation – something that ordinary glass doesn’t take very well.


Instead of adjusting to the cold and hot temperatures, ordinary glass explodes inside the microwave!  


Furthermore, the ordinary glass will absorb heat from microwaving and get dangerously unstable.  As you open the microwave to remove the food, of course, you will touch the glass jar with a colder body, be it your hand or a towel—the sudden drop of temperature fractures the glass jar.


Not All Glass Jars Carry an Anti – Microwave Logos!

While ordinary glass is not flexible to sudden heat changes, there are some glasses that perceive heat almost like metals; an outstanding example is the mason glass jars.


Mason glass jars are resistant to heat changes making them practical in heat- extensive processes like canning. The same kitchen inspired qualities earns mason glass jars a special place in the microwaving.


Unlike ordinary jars made of ordinary glass, mason jars take a complex engineering recipe containing borosilicate- a stable material that is heat resistant. Nonetheless, before microwaving food, remove the metallic lid. Glass jars with lids results in abnormal heat buildups inside them and can cause a catastrophic explosion despite its constituents!


Borosilicate glass is rock-solid, but it is easily preyed by extreme temperature changes between freezing points in the fridge and boiling points in the microwaves. Before losing your favorite homemade pickles in a glass jar stored in a fridge to a microwave, take some precautions!


Heating a glass jar immediately after removing it from a freezer is dangerous. It is advisable to remove the glass jar out of the fridge some hours before microwaving.


Notably, always go for glass jars with microwave symbols, showing that they can be used to warm food inside a microwave. Such glasses are tested and proven fit for riding a microwave. But also take some time to understand the manufacturer’s guidelines.


There are some dos and don’ts, which will not only save your food from spilling out of an exploding but also protect you from kitchen accidents tied to broken jars.


FAQs About Microwave Glass Jar

How Can You Tell If A Glass Is Microwave Safe?

Looking at the glass jar constituents (the material used to make it) will give you a glimpse of whether it’s microwaveable or not. However, most manufacturers disclose if a glass jar can be used in a microwave or not through symbols or words.


Is It Safe To Put Cold Glass in The Microwave?

It depends on the coldness degree. Microwaving a glass directly from a fridge is dangerous. You need to remove it from the refrigerator a few minutes before putting it in a microwave to improve safety odds.


Can You Microwave Mason Jars?

KAMOTA Mason Jars

Yes. Mason jars were the earliest glass jars to be made using borosilicate. As mentioned earlier, the borosilicate glass jar does very well in heated environments like in the microwave.  


Can You Microwave Double-Walled Glass?

Can you microwave glass?


Absolutely yes, glass is microwavable. It can withstand high temperatures inside your microwave.


Double-walled glasses are crafted with robustness and resilience on a borosilicate base.


They’re ideal for keeping both warm and cold drinks, thus making them exceptionally suited for high temperatures inside a microwave.



Nowadays, companies are exploring the market gap vacuumed by the lack of microwaveable glass jars.


That wasn’t the case in the past; if you have an old 1960’s glass jar you collected somewhere as a souvenir, don’t put it in the microwave!


You will lose the poor thing you relished a lot, plus the loss comes with an extra bonus of spoiled food!

Bonus Safety Tips:


  • Never put a sealed or glass jar with a lid in a microwave, the heat buildup during heating will explode the glass jar!
  • Stick to glass jars with microwave symbols; they are multipurpose, efficient, and heat resistant; thus, when used properly, they multiply your kitchen safety standards.
  • Also, a little chemistry knowledge of the main materials used in making glass jars will greatly aid you in determining an appropriate safety partner during microwaving.

Final Thoughts

Understanding the concept of microwaving glass jars is simple physics. First, glass jars aren’t supple to heat – they snap when exposed to extreme temperatures like the one used to warm food!


Of course, not all glass gives in to heat; borosilicate glass jars take a hefty punch of microwave temperature and still survive. Also, be keen on microwave symbols indicating that it is safe to use the glass jar inside a microwave.


Finally, other than the effects of heat on glass jars, there is no evidence implicating glass jars on food quality. Now the answer to your question ‘can you microwave glass jars’ is clear.

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