If you notice that the bottom of a plastic product often has a triangle with an arrow, it is a "regeneration" sign. At present, there are 140 kinds of plastic numbers in China, and our common polycarbonate (PC) material drinking water barrel code is 58. The difference in Arabic numerals represents the different properties and different uses of this plastic material, just like the identification of plastic products. Although the country and the industry have not made a unified request for the logo on the lunch box, but listen to Professor Dong Jinshi's interpretation, in order to understand the consumption moments.
The number "1" means that the material of the plastic is PET, that is, polyethylene terephthalate, common mineral water bottle, carbonated beverage bottle, etc., heat resistance to 70 ° C, easy to deform, and substances harmful to the human body are dissolved; Sunbathe in the car, can not contain alcohol, oil and other substances. The bottle of this mark can no longer be filled with water after use, and the bacteria and microorganisms in the bottle after opening have entered, and the sanitation of the water supply cannot be guaranteed. In addition, the plastic will age, and repeated use may precipitate harmful substances. Please throw it into a recyclable bin and let it be recycled.
The number "2" indicates that the plastic is made of HDPE, which is commonly used as a bottle for cleaning products and shower products. Often used in the production of food bags, some beverage bottles are also produced from this material.
The number "3" indicates that the plastic is made of PVC. This kind of material is prone to harmful substances when it is hot, and even it will be released during the manufacturing process. When toxic substances enter the human body with food, it may cause diseases such as breast cancer and birth defects. At present, the material itself is very hard. In order to be easy to process, plasticizers are often added, especially PVC plastic wrap. The content of plasticizer is more than 30%, and it is not suitable for high-temperature foods containing grease.
The number "4" indicates that the plastic is made of LDPE. General products are cling film, plastic film, and the like. The heat resistance is not strong. Generally, the qualified PE cling film will have a hot melt phenomenon when the temperature exceeds 110 ° C, leaving some plastic preparations that cannot be decomposed by the human body. Also, you can wrap foods that contain fat, but not in a microwave. Therefore, when the food is placed in the microwave oven, the wrapped plastic wrap is first removed.
The number "5" indicates that the material of the plastic is PP. High temperature resistance, more common in microwave lunch boxes. It can be reused after careful cleaning. Need special attention, some microwave lunch boxes, the box is indeed made of No. 5 PP, but the cover is made of PS PS (polystyrene), because PS can not withstand high temperature, it can not be placed in the microwave together with the box . To be on the safe side, remove the lid before placing the container in the microwave oven.
The number "6" indicates that the material of the plastic is PS. More common in bowls of instant noodles, fast food boxes. It is also heat-resistant and cold-resistant, but it cannot be placed in a microwave oven to prevent the release of chemicals due to excessive temperature. And can not be used to contain strong acid (such as orange juice), strong alkaline substances, because it will break down the styrene monomer that is not good for the human body, it is easy to cause cancer. Therefore, you should try to avoid using hot food boxes to pack hot food.