Look at the logo on the bottom to judge whether the plastic lunch box can be heated

Generally, there is a triangle mark on the plastic lunch box, with different numbers from 1-7 marked inside, representing different materials, and also indicating the heat-resistant temperature of the lunch box. Whether the plastic lunch box can be heated or not, just look at this sign to know.

Among the 7 types, only the plastic lunch box marked with number 5 can be heated in a microwave oven. Its composition is polypropylene, which can withstand heat up to 130°C. When choosing a plastic lunch box, if you see a "5" mark in the triangle at the bottom, this type of plastic lunch box can be heated in a microwave oven, but you still have to choose a branded plastic lunch box, the quality is more guaranteed.

Special reminder, if there is no such mark on the lid of the plastic lunch box, be sure to remove the lid when heating. When cleaning this type of plastic lunch box, do not use sharp objects to prevent scratching the surface of the plastic, which will produce bad chemicals when heated.