We frequently receive the question: “Can Mason jars be heated in the microwave?” In this article, we’ll provide a detailed answer and share practical tips for safely using Mason jars in the microwave, helping you avoid common pitfalls and ensuring peace of mind.

 

 

Figure 1 mason jars contain different food

 

 

Can I Microwave Mason Jars?

 

Yes! Mason jars are a popular choice for food storage and canning. Some Mason jars feature a microwave-safe symbol, indicating they can be safely used in the microwave. However, it’s important to follow certain precautions:

○ Check for Damage: Ensure the Mason jar is free from cracks or chips. Damaged glass can expand rapidly when heated, potentially causing the jar to shatter or explode, which can be dangerous and may result in injuries or damage to your equipment.

○ Cover Loosely: When heating food in a Mason jar, you can cover it with a lid to prevent splattering and ensure even heating. However, avoid sealing the jar completely to allow steam to escape.

○ Monitor Heating Time: Avoid prolonged heating, and be cautious when handling the jar after microwaving to prevent burns. It’s recommended to use microwave-safe gloves when removing the jar from the microwave.

 

 

Figure 2 glass mason jars in a microwave

 

Can I microwave Mason jars with lids on?

 

No, the metal seals, lids and rings of Mason jars are not microwave safe. Therefore, please remove these metal parts before heating.

 

 

What should I do if a Mason jar cracks in the microwave?

 

If a Mason jar breaks in the microwave, here are some safety precautions and cleanup measures you need to take:

○ Turn off the microwave to prevent further damage or potential hazards. Allow the microwave and the objects inside to cool down to prevent burns and further breakage.

○ Wear oven mitts or heat-resistant gloves to protect your hands from hot glass and injuries. Carefully remove the jar and glass pieces to clean up spills and glass shards. You can use thick, damp paper towels or cloths to pick up large pieces of glass. For smaller pieces, you can use a vacuum cleaner with a hose attachment to avoid leaving any fragments behind. Wipe the inside of the microwave with a damp cloth to remove any remaining debris or food.

○ Discard the broken jar pieces individually in a paper box or thick bag to avoid injuries.

 

 

Are there any foods I should never microwave in Mason jars?

 

Not all foods can be heated in a microwave. For example:

○ Chili peppers: When you heat chili peppers directly for a long time, capsaicin will evaporate, which may irritate your eyes and nose when you open the microwave.

○ Eggs: Cooked eggs cannot be heated in a microwave, even for a dozen seconds. Even if they look safe, they are likely to explode when you pry or crack them open, which is quite dangerous. If you need to heat eggs, remember to cut them.

○ Foods wrapped in plastic and tin foil: Plastic packaging may deform or even melt, so do not heat them for too long. Tin foil can easily catch fire when heated in a microwave.

 

 

Can I microwave cold Mason jars straight from the fridge?

 

Absolutely not! The sudden temperature change can cause the glass to crack or even explode. The correct way is to let the glass jar cool to room temperature before heating it in the microwave. Or pour the food into a new container and heat it in the microwave.

 

 

Figure 3 wide-mouth glass mason jars with fruit inside

 

In summary, Mason jars are generally safe in the microwave. To safely heat food in Mason jars in the microwave, follow these tips.