What do the numbers 1 to 7 at the bottom of the plastic container mean


The numbers 1 to 7 at the bottom of the plastic contain […]

The numbers 1 to 7 at the bottom of the plastic container mean: the symbol of recycling.

Each plastic container has an "identity card", usually on the bottom of the plastic container. There are numbers 1 to 7 inside the triangle, and each number represents a type of plastic container.

The plastic product recycling label is formulated by the relevant agencies of the plastics industry in the United States. This set of signs stamps the plastic material identification code on the container or packaging, from No. 1 to No. 7, so that people can simply join the ranks of recycling without having to bother to learn the similarities and differences of various plastic materials.

"No. 1" represents polyethylene terephthalate (PET, commonly known as polyester resin), which is often used to make mineral water bottles and carbonated beverage bottles. The beverage bottle is heat-resistant to 70°C when used, and is only suitable for warm or frozen beverages. It is easy to deform when filled with high-temperature liquid or heated, and substances harmful to the human body will melt out.

"No. 2" stands for high-density polyethylene plastic (HDPE), which is mostly used to make containers for cleaning supplies and bath products. It is not recommended to recycle if the cleaning is not thorough.

"No. 3" stands for polyvinyl chloride (PVC), which is rarely used in food packaging at present, and it is best not to buy it.

"No. 4" stands for low-density polyethylene plastic (PE), which is a commonly used material for the production of cling film and plastic film. The heat resistance of the plastic wrap is not strong. Usually, the qualified polyethylene plastic wrap will melt when the temperature exceeds 110℃, leaving some plastic preparations that cannot be decomposed by the human body. Therefore, the use of plastic wrap to wrap the food surface should be avoided. heating.

"No. 5" stands for polypropylene (PP), which is used in the production of microwaveable lunch boxes. The only plastic case that can be placed in the microwave and can be reused after careful cleaning.

"No. 6" stands for polystyrene (PS), which is often used in the production of bowls of instant noodle boxes and fast food boxes. Heat-resistant and cold-resistant, but cannot be placed in a microwave oven, and cannot be used to carry strong acids (such as orange juice) and strong alkaline substances, which will decompose polystyrene that is harmful to the human body and is easy to cause cancer.

"No. 7" stands for Polycarbonate (PC) and others. PC is a material that is widely used, especially for the manufacture of baby bottles, space cups, etc. It is easy to release the toxic substance bisphenol A, which is harmful to the human body. Do not heat when using, and do not expose to direct sunlight.