Other lightweight plastic wraps have a tendency to become distorted in the microwave oven. Wax paper or paper towels are good covers to use in the microwave oven. Plastic baby bottles can be used for heating milk or formula. Spatulas and spoons for non-stick pans can be left in the oven for a short time. Plastic utensils should be used only for heating foods to serving temperature.
Longer cooking causes the food to reach a high temperature and distorts the plastic.
Paper such as napkins, towels, plates, cups, frozen food cartons, freezer wrap and heavy cardboard is suitable for microwave oven use. They may help to absorb moisture and prevent splatter if they're placed over the food. Rolls and breads can be heated in a napkin or cloth to prevent them form becoming soggy. Avoid cooking foods on paper for long periods. Straw or wooden baskets with no metallic paint or staples can be used for reheating breads.