Can Food Plastic Boxes Be Microwaved?

Now meals are taken out or packed, using food plastic boxes, which are easy to carry. Some people have a microwave at home, and when the food is cold, they want to use the microwave to heat it. then Can food plastic boxes be microwaved? The number 5 in the triangle arrow on the outside of the plastic lunch box is OK.
There is only one material that is resistant to high temperature and suitable for microwave oven heating, that is, polypropylene (PP), and the plastic material identification code is 5, and other types are not allowed. If there is no corresponding label, then change to a lunch box suitable for microwave ovens and heat it.
When using a microwave oven, put the food into the microwave oven special heating box to heat it, so as not to use other boxes to affect the hygiene and safety of the food, and do not put the metal container in the microwave oven to heat, sparks may cause danger.