Use Only Microwave Safe Containers When Cooking
and Reheating Foods
The accessibility and convenience of
microwave ovens make them a great choice for cooking and
reheating food. Whether at home, work, school, college
dorm, traveling in your camper or staying at a hotel, microwaves are usually
readily available. With so many consumers utilizing microwaves it is important to use proper
containers in the microwave. 
Many food containers are not safe for
use in a microwave oven. Manufacturers label safe cups, bowls and plates
stating “microwave safe.” Containers that do not have this label should not be
used in the microwave. If you have ever been surprised by how hot a plate or
bowl can become after being removed from a microwave, you know not all
containers distribute heat the same. Glass and ceramic containers, along with
plastic utensils that are labeled “microwave safe” are good choices. Do not use
glass or ceramic that contains a metal rim.
If you cannot find a label indicating the bowl or plate
is microwave safe you can test it using these instructions:
1.
Place the empty container you want to test
inside the microwave.
2.
Place a second container with one cup
of tap water inside the microwave.
3.
Heat on high for one minute then
carefully test the temperature of the empty container.
If the empty container is cool it is microwave safe; if
it is slightly warm only use this container for reheating. If the container is
hot it is not microwave safe and should not be used in the microwave.
Be sure to remove food stored in take-out containers,
plastic cold-storage containers or on a polystyrene tray and transfer to a
microwave safe container before reheating or cooking. Food packaging containers
are not safe for use in a microwave as they were not designed for exposure to
heat. It is not safe to heat food in plastic bags, brown paper bags, on paper
towel, paper napkins or a colored paper plate. All of these items can emit
chemicals that can migrate into food.
Microwaves provide a quick and convenient cooking option
however food is only safe to eat if the food container used is designed
specifically for heat. Consumers should always use safe microwave
reheating information to ensure proper internal food temperatures to
prevent “cold spots” in your food which are a haven for harmful bacteria.
Source: Michigan State University Extension
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