Correct identification of plastic lunch boxes
At present, most of the plastic lunch boxes sold on the market are polyethylene and polypropylene products. Both of these materials can withstand high temperatures above 100 °C and are relatively safe to use. Consumers should pay attention to whether the products are marked with PE (polyethylene ) and PP (polypropylene) words, the most common "5" represents "polypropylene", that is, "PP" material. The temperature resistance range of this PP material is -20 degrees to 120 degrees, which can be suitable for microwave heating.
It has been said before that, among all plastic lunch boxes, only the lunch box marked "5" (PP material) can be used for microwave heating and is the most safe. But the PP material also has different grades, and the pure PP material plastic lunch box is extremely safe.
So how to identify whether the PP material is pure? In addition to looking at the brand and related test reports, you can also identify by the following methods:
1. Smell: If there is a pungent plastic smell or the smell still exists after being filled with water, it is almost certain that there is a problem.
2. Look: compare similar lunch boxes together, the more transparent, the purer it will be.
3. Pinch: You can pinch the toughness of the product, and those that are too brittle and too thin can be eliminated; check to see if the product's logo map, whether the logo is clear, and whether the plastic box body and lid have corresponding material markings.
