1. Judge by the material
Check whether there are impurities in the lunch box. Some paper bowls look very thick. The surface is made of food-grade materials, while some recycled paper is used in the middle. If misused without checking it out, it is likely to cause food poisoning. For opaque lunch boxes, pay more attention to the material of the lunch box when buying. If it can be torn open, open it for inspection.
These lunch boxes are generally composed of multiple layers. When you observe, you can check whether the product has impurities. The appearance is clean or you can tear it to see if the inner layer is a qualified food grade PP material, so you can be more assured.
2, judge by smelling
If the lunch box produces a peculiar smell after pouring hot water into it, be aware that it may be toxic and harmful and avoid using it. There are many low-quality lunch boxes with pungent and pungent odors, which are likely to contain harmful substances, which will volatilize under high temperature conditions and migrate into the water into the food, thereby endangering human health. So everyone should choose a disposable lunch box with no peculiar smell.
3. Judge by looking at the signs on the lunch box
General regular disposable lunch boxes should be marked with the QS logo and number on the box, including instructions for use, use, use environment, use temperature and other content.