Here are some recommendations for more safely heating food in the microwave. Never microwave thin plastics as they can melt. Look for products specifically labeled as "microwave-safe".
Kitchen Essentials
Containers
Vented Container
Glass Baking Dish
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Materials
plastic container
glass container
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Instructions
Try not to microwave foods that have high fat in the plastic.
Never place plastic in a conventional oven.
Microwave 30 seconds at a time.
Never microwave non microwave-safe containers for risk of personal injury or fire.