Urban legends abound on the prospective side-effects and health dangers connected with microwaving styrofoam plates and cups. Styrofoam is a great insulator with an R-value of about R-5 per inch. Although it may be safe to use styrofoam and other plastic containers marked microwave-safe, you must be very careful to vent your food and be sure not to burn it. Styrofoam does not break down or lose its shape over time. Styrofoam is a type of plastic which is argued to be among those that are not normally microwave-safe, but that can be manufactured for microwave use as well. Traditional Styrofoam. This way, there’s less chance of leech into the food it holds.” Polystyrene consists of styrene and benzene that are regarded as harmful compounds. There are several types/grades of Styrofoam and their ‘microwave-ability’ depends on several things. Due to the high content of air, styrofoam is virtually unsinkable. If it is microwaveable, you should find a label or symbol that should let you know if you can use the container in a microwave. Chances are you come into contact with Styrofoam products on a daily basis. Can You Microwave Styrofoam? Styrofoam, known also by generic title polystyrene, is a kind of plastic that’s made of expanded polystyrene beads. If you aren’t sure, skip it. Can you microwave Styrofoam? Common items made of styrofoam that are microwaved (that probably should not) include coffee cups, takeout containers, disposable plates, and cup noodles. The only type of styrofoam you should ever microwave is styrofoam that is marked to be microwaveable. Firstly, the belief that Styrofoam and plastics should never be microwaved is not accurate, despite this misconception being spouted in lots of places. The product will be labeled on the bottom to prove the material is safe and tested for microwave usage. If the container says it's suitable for single use only, do not repeatedly microwave the plastic. As mentioned earlier, there are two types of Styrofoam. Before we delve deeper and answer the question as to whether or not you can microwave Styrofoam, let us first distinguish the two different types of Styrofoam – the traditional Styrofoam or polystyrene and the newer version of Styrofoam.. 1. “Styrofoam in microwave should only be considered safe when there is a label on it that says so. This is the FDA’s approved way to reassure the foam’s stability under extremely high temperatures. Styrofoam products that the FDA has deemed safe through testing for food usually carry the "Microwave Safe" label. The best way you can be assured of the type of Styrofoam and whether you can rely upon it when microwaving it can be to check the sides or the bottom of the cup or any other Styrofoam container. Can You Put Styrofoam in the Microwave? Can You Microwave Styrofoam? You may want to avoid risk and simple transfer your food to a glass or ceramic container to heat in the microwave; as the old adage goes: better safe than sorry. Can You Microwave Styrofoam Plates and Cups? Yes, you can safely microwave Styrofoam if the container is marked as microwave-safe. In the case of plastics, it’s said that some types can be manufactured in a way that allows for usage in a microwave oven.