Disposable plastic lunch boxes have a triangle with an arrow at the bottom of the tableware, which is a "recycled" sign. There are Arabic numerals from 1 to 7, and the different Arabic numerals represent the different properties and different uses of this plastic material. It's like a plastic piece of identification.
The number "1" of disposable plastic lunch boxes and tableware represents that the material of the plastic is PET, that is, polyethylene terephthalate, common mineral water bottles, carbonated beverage bottles, etc., which are heat-resistant to 70 °C, easy to deform, and have substances harmful to the human body to dissolve; after 10 months of use, carcinogen DEHP may be released; can not be placed in the car in the sun, can not be filled with wine, oil and other substances. Bottles with this label cannot be filled with water after use, so please dispose of them in the recyclable bin and let them be recycled.
The number "2" of disposable plastic lunch boxes and tableware represents that the material of the plastic is HDPE, which is commonly used as packaging bottles for cleaning supplies and shower products. Not for use in food packaging.
The disposable plastic lunch box tableware number "3" means that the material of the plastic is PVC. This material is prone to harmful substances when it is at high temperatures, and even it will be released during the manufacturing process, and after the toxic substances enter the human body with food, they may cause breast cancer, neonatal birth defects and other diseases. At present, containers of this material are rarely used to package food. If in use, never allow it to be heated.
The disposable plastic lunch box tableware number "4" represents the material of the plastic is LDPE. General products are plastic wrap, plastic film, etc. The heat resistance is not strong, usually, the qualified PE plastic wrap will be hot melt when the temperature exceeds 110 °C, leaving some plastic preparations that the human body cannot decompose. In addition, wrapping food in plastic wrap and heating it can easily dissolve the harmful substances in the plastic wrap from the fat in the food. Therefore, when putting food into the microwave, remove the wrapped plastic wrap first.
Disposable plastic lunch box tableware The number "5" indicates that the material of the plastic is PP. High temperature resistance, mostly seen in microwave oven lunch boxes. Can be reused after careful cleaning. It should be noted that some microwave oven lunch boxes, the box body is indeed made of No. 5 PP, but the lid is made of No. 1 PE, because PE cannot withstand high temperatures, so it cannot be put into the microwave oven with the box body. To be on the safe side, remove the lid before placing the container in the microwave.
The disposable plastic lunch box tableware number "6" represents the material of the plastic is PS. It is mostly seen in bowl-filled instant noodle boxes and fast food boxes. It is resistant to heat and cold, but it should not be put in the microwave to avoid the release of chemicals due to excessive temperature. And it cannot be used to contain strong acids (such as orange juice) and strong alkaline substances, because it will decompose polystyrene, which is not good for the human body, and is easy to cause cancer. Therefore, you should try to avoid packing piping hot food in fast food boxes.
Disposable plastic lunch boxes and tableware, the number "7" represents the material of the plastic, other than PVC and polystyrene, or a composite material made of multiple plastic materials. It is more common in kettles, cups, and feeding bottles. It is resistant to high temperatures and can be used repeatedly, but it cannot be heated in the microwave.