Pp5 material can be heated by microwave oven, and lunch boxes sold in the market generally have a triangular sign at the bottom, which will be marked with different numbers, from 1~7 respectively. This also represents different materials, so whether it can be put into the microwave oven for heating depends on its materials.

If pp5 is displayed, it means that it can be put into the microwave oven in Weibo.

If the number 1 is shown above, it can't be heated by microwave oven, exposed to sunlight or baked at high temperature. The main products are drinks or mineral water bottles.

If 4 is displayed, it means it is suitable for plastic wrap. If there is food to be heated in the microwave oven, it must be wrapped with plastic wrap before entering the microwave oven.

If you choose 7, this material is a kettle or a baby bottle, and you can't put it in the microwave oven for heating.