Is your lunchbox safe? A comprehensive guide to common materials and usage precautions

The triangular mark at the bottom of the dining box is its security "ID card": * * No. 5 PP * * High temperature resistant (about 120 ℃), which is the only universal plastic that can be microwave heated. It is recommended to remove the lid when heating; **No. 6 PS * * (foam or hard transparent lunch box) has poor heat resistance (70-90 ℃) and cannot be microwaved to avoid containing hot or greasy food; **PET # 1 (beverage bottle) is heat-resistant to about 65 ℃ and is only for one-time use. For safe use, it is important to remember: identify PP when using microwaves, do not reuse disposable meal boxes or hold hot food, and replace them promptly if damaged. The habit of checking labels should be developed in daily life, and safe glass or ceramic meal boxes are recommended for long-term use.