Quick Answer: No, you can't microwave foam plates due to the materials used in their design. There's also some confusion where Styrofoam is concerned, which we'll clear up below...
First things first: Let's learn more about foam plates...
What Is a Foam Plate?
Different Types of Foam Products
How Do You Know If a Foam Product Is Microwave Safe or Not?
Labels on Foam Products to Be Aware Of
The label you want to see on an item that will verify its microwavable status is "microwave safe."
However, there are labels that can tell you that a product is not safe for the microwave. For example, if you check the recycling label and see