We know about…
Aluminum Foil – doesn’t play nice with microwaves.
Plastic Containers – One-time use plastic containers — such as yogurt, margarine or sour cream — shouldn’t be used in the microwave. They’re intended just for one time use and aren’t equipped to withstand high heat. The containers could warp or melt in the microwave, which can release chemicals into your food.
But you can’t microwave THESE either:
Chinese Take Out Containers – risk of catching on fire
Paper – Keep paper bags, plastic bags or newspapers out of the microwave. They are not sanitary, may cause a fire, and may emit toxic fumes
Eggs – Don’t let the internet fool you — making hard boiled eggs in the microwave oven is trouble. The rapid heat from the microwaves creates a lot of steam in the egg. The steam has no where to go except to explode out so that’s exactly what it does.
Styrofoam containers – If you are still reheating your take out in these containers, keep this in mind: styrofoam is a type of plastic. And plastic doesn’t play nice in the microwave — unless otherwise marked on the container.
Rimmed plates – Some plates are rimmed with metals, be careful!!
Travel mugs – Many travel mugs are not safe to put in the microwave. If it’s made from stainless steel, don’t nuke it. The stainless steel will block the heat from warming your coffee or tea and can damage your microwave.
If it’s plastic, check the bottom of the mug to see if it’s marked as microwave safe.
Nothing – If you turn the microwave on with nothing in it you’ll probably blow the whole thing. Since there is nothing to absorb the microwaves, like food, the magnetron — the thing that makes the microwave function — ends up absorbing the microwaves and essentially self destructs.