Rubbermaid food storage containers are made from various types of plastic or glass and are all designed to be microwave-safe—but you should still take a few precautions before heating up your leftovers in these containers.
What to Look For
If you have an older Rubbermaid dish lying around or if you're unsure if your specific container is okay for the microwave, look at the bottom. It should say "microwave-safe" or have an image of a microwave displaying the word "reheat."
Before putting the Rubbermaid container in the microwave, remove the lid, or open up the corners for ventilation. If you microwave food with the lid sealed, pressure can cause the lid to pop off during cooking, making a mess.
Be cautious while removing the dish from the microwave after heating. Plastic containers get hot fast and could burn you.
According to the National Institute of Environmental Health Sciences, Bisphenol A, or BPA, in plastic has been shown in animal studies to be harmful to a growing fetus or young child. However, independent studies showed that the compound did not leach into food. Older lines of Rubbermaid, such as the Premier or Easy Find Lids, were made with BPA-containing plastic. As of 2009, Rubbermaid updated their products so that they are made with BPA-free plastic.