Can You Microwave Cardboard?

microwave cardboard

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LEARN WHEN YOU CAN MICROWAVE CARDBOARD CONTAINERS AND WHY YOU PROBABLY SHOULDN’T

Ever thought about reheating your leftovers in their cardboard containers?

In a hurry to eat?

Don’t want to mess up more dishes than necessary?

Yep, I have. Then, I did my research and decided I shouldn’t do it. Here’s why.

WHAT CARDBOARD CAN YOU MICROWAVE?

From time to time you may find a few cardboard containers marked, “microwave safe.”

From my research, if a cardboard container is marked, “microwave safe, ” it should be safe to microwave on a lower setting for a short period of time.

How short of time and at precisely what setting?

It all depends on your microwave and in my research, I couldn’t find any concrete guidelines for you.

I suspect the lack of concrete guidelines is a liability issue due to the varying powers of microwaves.

Unfortunately, most cardboard containers don’t say anything about whether the cardboard is microwaveable or not. 

So, if you still insist on microwaving that cardboard, you must do the following each and every time you microwave cardboard containers:

  • Look for and remove all metal. Make sure there is no metal on or in the cardboard container like metal handles as they may spark and cause damage to your microwave.
  • Make sure the cardboard container does not contain plastic or wax coatings that could melt or emit toxic fumes.
  • Ensure there is food in the container so the cardboard doesn’t catch on fire. Because microwaving cardboard by itself is a safety hazard, I thought I would mention it.

HOW DO YOU KNOW IF YOUR CARDBOARD CONTAINS METAL?

Some cardboard containers have metal handles so they would need to be removed. You should inspect the outside of the package carefully.

As to whether your cardboard contains any small metal fragments from the manufacturing or recycling process, there is no way to be 100% sure.

HOW CAN YOU TELL IF YOUR CARDBOARD HAS A PLASTIC OR WAX COATING?

Many containers like milk may have a plastic coating on the inside to keep the liquid from seeping through the cardboard. 

Cardboard that is coated in plastic or wax is smooth and slick. You can scrape your fingernail across the container to see if you scrape off any plastic or wax.

HOW LONG CAN YOU MICROWAVE CARDBOARD?

Reheating food for too long could damage the cardboard container rendering your food inedible. 

What is too long? Honestly, I don’t know. I spent a long time trying to find out that answer and I don’t believe it exists. The reason is probably due to the fact that microwaves vary in power. 

DOES REHEATING FOOD IN CARDBOARD CONTAINERS SAVE TIME?

In my experience, no!

It takes me more time to carefully inspect a cardboard container then it does for me to pop the food on a microwave-safe plate and wash the plate after I was done.

IS REHEATING FOOD IN CARDBOARD CONTAINERS WORTH THE RISK?

In my humble opinion, absolutely not!

Don’t take a chance of exposing your family to potentially harmful toxins or risk a fire or other damage to your microwave over a cardboard container!

Err on the side of caution. Get your family in the habit of never heating food in cardboard containers.

KEY POINTS:

The only way to know with a fair amount of certainty that your cardboard container is microwavable is for your cardboard box to state it is “Microwave Safe.”

Otherwise, you could be playing with fire…literally! 

And you could be exposing your family to harmful toxins!

Most cardboard containers won’t state they are microwave safe, so you will need need to take the time to carefully check every container for metal and plastic or wax coatings before you put it in the microwave. 

You will also need to be careful not to microwave it for too long or too high of a setting. 

Furthermore, if your kids reheat items in the microwave, do you trust them to remember which cardboard is “microwave safe” and which is not?

My recommendation is to never microwave any cardboard in the microwave. It is just not worth the risk or effort!

It will take you less time to grab a plate or bowl from the cabinet and to wash that plate than it will to properly inspect a cardboard box.

I always err on the side of caution when it comes to my family’s health, don’t you?

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