They make heating food and defrosting frozen dishes infinitely faster and easier. If you really want to use your microwave to heat plates try putting a bowl of water on top of the plates so that most of the energy will be absorbed or if your microwave is a combi oven warm the plates with the grill of convection instead. Hs 1pc Microwave Plastic Plate Stacker Multifunction Time Saving Kitchen Tool Read More Reviews Of The Pr Microwave Oven Shelf Food Trays Microwave Plastic It may take 5 minutes instead of 1 minute but wont affect the microwave in any way. Heating plates in microwave . What improves life more than the ability to prepare food in under two minutes. Its unlikely to hurt you - the front window with its mesh will almost certainly stop it - but it will damage the plate and possibly scratch your microwave. If your plates contain sufficient water then yes its safe to heat them in the microwave. So if your microwave is heating the plate which shouldnt in its atomic ...