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Plastic lunch box safety classification

Each plastic product has a triangle with an arrow at the bottom, which is the "recycling" symbol. There are Arabic numerals from 1-7. The difference of Arabic numerals represents the different performance and different uses of this plastic material. Just like the identification of plastic products.
The number "1" indicates that the plastic material is PET, that is, polyethylene terephthalate, common mineral water bottles, carbonated beverage bottles, etc., heat-resistant to 70 ℃, easy to deform, and dissolve harmful substances to the human body; use After 10 months, the carcinogen DEHP may be released; it cannot be placed in the car to sunbathe, and it cannot be filled with wine, oil and other substances. Bottles with this kind of logo can no longer be filled with water after use. Please throw them in a recyclable trash bin and let it be recycled.
The number "2" indicates that the plastic material is HDPE, which is commonly used as a bottle for cleaning products and shower products. Not for food packaging.
The number "3" indicates that the plastic material is PVC. This material is easy to produce harmful substances at high temperature, and it will be released even during the manufacturing process. After the poison enters the human body with food, it may cause breast cancer, birth defects and other diseases. Containers of this material have been rarely used for packaging food. If it is in use, never let it heat up.
The number "4" indicates that the plastic material is LDPE. General products are plastic wrap, plastic film, etc. The heat resistance is not strong. Generally, the qualified PE cling film will be hot melted when the temperature exceeds 110 ℃, leaving some plastic preparations that the human body cannot decompose. And, wrap the food with plastic wrap and heat it, the fat in the food can easily dissolve the harmful substances in the plastic wrap. Therefore, before putting food into the microwave oven, first remove the wrapped plastic wrap.
The number "5" indicates that the plastic material is PP. High temperature resistance is more common in microwave lunch boxes. Can be reused after careful cleaning. It is important to note that some microwave oven lunch boxes are indeed made of No. 5 PP, but the lid is made of No. 1 PE. Because PE cannot withstand high temperatures, it cannot be placed in a microwave oven together with the case. For safety reasons, remove the lid before placing the container in the microwave.
The number "6" indicates that the plastic material is PS. More common in bowls of instant noodle boxes and fast food boxes. It is heat-resistant and cold-resistant, but it cannot be placed in a microwave oven to avoid releasing chemicals due to high temperature. And can not be used to contain strong acids (such as orange juice), strong alkaline substances, because it will decompose polystyrene is not good for the human body, easy to cause cancer. Therefore, you should try to avoid packing hot food in fast food boxes.
The number "7" represents the material of the plastic other than PVC and polystyrene or a composite material of multiple plastic materials. It is more common in kettles, drinking glasses and feeding bottles. High temperature resistance, can be used repeatedly, but can not be heated in a microwave oven.
After distinguishing the differences and uses of plastic materials, you may wish to conduct a large inspection of the plastic tableware in your home to remove those plastic dishes that are harmful to health. In daily life, it is best to bring your own tableware or standard plastic food bags when buying food that is directly imported, such as cooked food and snacks. Disposable plastic lunch boxes or bags outside will allow toxic substances to penetrate the food. Refrigerating and frozen foods in the refrigerator should also use plastic wrap or plastic bags, not ordinary plastic bags. It is better to use porcelain cups, porcelain bowls or glasses or glass bowls for daily drinking and eating.