The following dishes are not microwave-safe:

Dishes with metal decorative elements — ones with gold, silver, or platinum bands will reflect microwave energy and may cause arcing.
Aluminum trays may also cause arcing, so make sure to transfer food to a microwave-safe dish.
Any metal utensils — in addition to being a fire hazard, metal will act as a barrier between the food and the microwave energy and won’t let the food get heated.
Wooden utensils — when microwaved, wood dries out and can split or crack.
Cardboard dishes — the material may contain adhesive, wax, and other substances that may be hazardous when microwaved. Some cardboard takeout boxes have metal handles or clasps that can cause arcing and present a fire hazard.
Plastic foam containers — if exposed to high temperatures, the material may melt and contaminate the contents of the container.
Disposable plastic containers, such as plastic containers used for yogurt, cottage cheese, and other foods are not microwave-safe.
Old plastic containers can’t be microwaved, especially if they are cracked or discolored.

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