Science Popularization: do you know what the signs on plastic lunch boxes stand for?

Plastic lunch boxes are often used in our daily life, whether it's for takeaway or at home. But do you really know the good or bad of these plastic lunch boxes?
If using plastic lunch box, it is necessary to recognize the logo on the box and select the appropriate safety lunch box.

Here are some common signs on plastic lunch boxes:
Can be used to hold direct food bowls

Can be used in microwave oven

Can be refrigerated

Recyclable plasticshttps://www.yiqiangplastic.com/index.html

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