Plastic products also have a shelf life. After the expiration date, the plastic will age, discolor and become brittle. If the plastic box used is found to be yellow or no longer transparent, it should be replaced as soon as possible. Therefore, there are always people on the Internet saying, “Plastic lunch boxes have been used for a long time, and there will be unevenness inside, and the missing part will be eaten into the stomach.” Don’t believe it~ Therefore, consumers must pay attention to plastic products. The shelf life. At the same time, aging plastics may release substances that may be harmful to the human body. As for the "life" of a plastic lunch box, it depends on personal use and cleaning methods. The shelf life of most plastic products is generally about three to five years. If it is used frequently, it is better to replace it in one to two years.

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