The number "5" indicates that the plastic is made of PP […]
The number "5" indicates that the plastic is made of PP. High temperature resistance, more common in microwave lunch boxes. It can be reused after careful cleaning. Need special attention, some microwave lunch boxes, the box is indeed made of No. 5 PP, but the cover is made of No. 1 PE, because PE can not withstand high temperature, it can not be put into the microwave together with the box. To be on the safe side, remove the lid before placing it in the microwave oven.