Cardboard in the microwave - is that possible?

A question that hardly ever anyone really asks - but someday, somewhere suddenly appears: Can cardboard really in the microwave? And when not? And how is it with coated cardboard? Answers to all these questions are our contribution.

Microwaveable materials

Basically, any material is suitable for the microwave, which does not heat itself when irradiated with microwaves. This is related to the way the microwave works.

The technical structure of paper and cardboard is such that microwaves can easily penetrate them without the material heating up. So you do not have to worry about paper or cardboard starting to burn.

Strong oily or greasy paper

If there is a very thick, uncovered layer of oil on paper or cardboard, it can happen in some cases that the oil or grease heats up so much that paper or cardboard begins to burn, especially if they are saturated with the grease.

For most food packaging, however, this is excluded because the existing coating prevents the material from soaking up oil.

Aluminum coated cardboard

Basically, aluminum in the microwave is a problem dar. Although sometimes harmless, but not always. The same applies analogously to aluminum-coated cardboard trays.

The thin coating may melt due to microwave irradiation if excessive power is applied for a long time.

In addition, if the material is too close to the microwave generator (formerly: magnetron), sparking could occur, which then damages the microwave generator via feedback (this is irreparable damage - a total damage to the device). As a precaution, you should not put such coated bowls in the microwave.

Tips & Tricks

Basically, cardboard and cardboard can be in the microwave. This applies to most packaging. Only aluminum-coated packaging stays better outside.

Video Board: How to make a microwave from a cardboard