At present, most of the plastic lunch boxes sold on the market are polyethylene and polypropylene products, these two substances can withstand the high temperature of more than 100 deG C, it is safer to use, consumers should pay attention to whether the goods marked PE(polyethylene) and PP(polypropylene) words, the most common "5" on behalf of "polypropylene", that is, "PP" material. The temperature resistance of this PP material ranges from -20 degrees to 120 degrees.
How to identify whether PP material is pure? In addition to looking at the brand and related test reports, can also be identified by the following methods:
1, smell: if there is a pungent plastic smell or after filled with water, there is basically a problem.
2, look at the product: the same kind of lunch boxes together, the more transparent will be more pure.
3, pinch hardness: you can pinch the hardness of the product, too brittle too thin can be eliminated; Check whether the product logo is clear, whether the plastic box body and lid are marked with the corresponding material.
