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Have you noticed the numbers on these lunch boxes?

Update:29 Jun 2020
Summary:

With the prosperity of food and beverage delivery, we a […]

With the prosperity of food and beverage delivery, we are often reminded: is takeout hygienic and healthy? We often focus on the freshness of the takeaway ingredients and the sanitation of the environment and methods of handling the ingredients, but we ignore an important factor: whether the container for the takeaway is safe.
Nowadays, most of the utensils on the market are made of plastic. The safety of these disposable plastic tableware is related to the material of the plastic used. So, did you notice? The plastic boxes in our daily life are marked with numbers.

So what do these numbers represent?
They represent the different materials of plastics, generally represented by the numbers 01 to 07.
01: polyethylene terephthalate (PET), purpose: to make mineral water bottles, carbonated beverage bottles, etc., this material is heat-resistant 70 ℃.
02: high density polyethylene (HDPE) is commonly used to make plastic containers for cleaning products and bath products. It can withstand 110 ℃ high temperature. The plastic bags marked with food can be used to hold food.
03: polyvinyl chloride (PVC), commonly used in building materials, belongs to toxic plastic products. "Toxic" mainly refers to the monomolecular vinyl chloride which is not fully polymerized in the production process, and the harmful substances in plasticizers. These two substances are easy to precipitate when they encounter high temperature.
04: low density polyethylene (LDPE), commonly used to make fresh-keeping film and plastic film, has poor heat resistance. When the temperature exceeds 110 ℃, it will melt, leaving some plastics that cannot be decomposed by human body. Therefore, with this kind of wrap food for heating, the oil in the food is easy to dissolve the harmful substances in the film.
05: polypropylene (PP), commonly used to make microwave oven special lunch box, can withstand 130 ℃, is the only plastic box that can be put into the microwave oven, and can be reused after cleaning.
Special attention should be paid to some special lunch boxes for microwave ovens. The box body is made of PP No.05, but the box cover is made of PS (polystyrene) No.06. PS has good transparency, but it is not resistant to high temperature, so it can not be put into the microwave oven together with the box body.

06: polystyrene (PS) is commonly used to make instant noodles in bowls and fast food boxes. It is heat-resistant and cold resistant. But it can not be put into the microwave oven to avoid the release of chemicals due to high temperature, and can not be used to contain strong acid, strong alkaline substances.
07: other plastics (PC) containing bisphenol A, which is harmful to health.
Among the materials in 01-07, only 02, 05, 06, that is, high-density polyethylene (HDPE), polypropylene (PP), polystyrene (PS) is relatively safe to make lunch boxes.
In addition to these figures on the lunch box, consumers can also improve the product quality assurance by checking whether there are QS signs, production license number, manufacturer, production address and other information on the plastic box when purchasing disposable plastic tableware products. When purchasing, try to choose disposable plastic dining utensils with smooth surface and uniform color and colorless transparent products without decorative patterns, and try not to choose products that are too soft.
01-07, do you know the numbers on these lunch boxes?