How to Tell If Something Is Microwave Safe
Microwave Safe Dishes:
Examine the Dish
Turn the dish in question over, so the bottom is facing you. Read the back of the dish. Many dishes and containers state either “Microwave Safe” or “Not for Use in Microwaves.” If this isn’t clearly stated, continue to Step 2.
Turn Up the Heat
Set your microwave oven to its highest power setting. The method varies based on microwave manufacturer. Consult your microwave’s manual for exact instructions. Most microwaves have a “Power,” “Power Level,” “Menu” or “Settings” button. Usually, the default setting is the highest power.
Fill a glass measuring cup or glass bowl with 1 cup of water. Place both the cup of water and the dish in the microwave. For larger dishes and containers, place the cup of water on or inside the dish. Don’t pour the water into the dish in question.
Set the Time
Microwave the dish and cup for one minute. If the dish or container is warm or hot after heating, the dish or container isn’t microwave safe. If the dish or container is cool and the cup of water is hot, the dish or container is microwave safe. Note: if you placed the cup of water on or in the dish, the area around the cup may be warm. The rest of the dish should be cool if the dish is microwave safe.