The box is marked with No.5 PP Answer Analysis: There is a general classification of plastics in the world, and the number of 1-7 is generally used. Among them, polypropylene No.5 marked with the letter PP is the most heat-resistant material, which is often used in plastic appliances heated by microwave ovens. So before you put the takeout in the microwave, you can see if there is such a sign on the box.

The box is marked with No.5 PP.

Answer analysis: there is a general classification of plastics in the world, generally with 1-7 as the number. Among them, polypropylene No.5 marked with the letter PP is the most heat-resistant material, which is often used in plastic appliances heated by microwave ovens. So before you put the takeout in the microwave, you can see if there is such a sign on the box.