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Their flimsy nature easily conjures images of flaming edges, so it's understandable that many people assume that paper plates and microwaves don't mix. It may surprise you to learn that, according to the USDA, you actually can microwave paper plates. Yes, you read that right. Paper plates rank among items people did not realize they can cook in a microwave. However, there are a few caveats worth discussing before tossing just any old paper plate in your microwave and hitting "start."
If you think you've been using your microwave wrong this whole time, don't feel too duped. Despite the fact that it's technically safe, you're right to exercise some caution here. While the USDA indicates that microwaving paper plates is generally okay, it also advises, "For optimal safety, use white, unprinted materials." Some paper plates are lined with plastic film, which is not conducive to microwave safety. Additionally, decorative plates may contain trace amounts of foil or metallic paint, which are a major fire hazard in a microwave.
For instance, take those Disney character-laden paper plates often seen at toddler birthday parties. In all likelihood, these are not microwave safe. However, unadorned varieties, like classic white Dixie paper plates and cups, should fare better under heat.
Best practices for microwaving paper plates
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If you're going to start reheating food on paper plates, keep safety in mind. First and foremost, always check the plate's label to see if it's specified as being microwave-safe. Even seemingly plain white plates could potentially cause sparks to fly, in which case, promptly shut your microwave off. If you're unsure whether a paper plate is microwave-safe, err on the side of caution and reheat your food in a different, risk-averse vessel, like a ceramic plate with a microwave-safe label.
Paper plates listed as microwave-safe still carry some potential risks, so always exercise caution. It's best to microwave paper plates in short intervals to reduce the risk of overheating. Observe the cooking process from start to finish so you can pull the plug (aka hit "cancel") on the off-chance that a paper plate ignites in the microwave.
There are also practical concerns. Paper plates, especially microwave-safe ones that lack protective coating, tend to be fragile. It's probably best to avoid reheating heavy, greasy food on thin paper plates, given that they might wilt under the weight. All in all, while a moratorium on paper plates is a myth about microwaves you can leave behind, always be smart when placing paper dishware in your microwave.