01 stands for polyethylene terephthalate (PET), which is often used to make mineral water bottles, carbonated beverage bottles, etc. This material has a heat resistance of 70°C.
02 stands for high-density polyethylene (HDPE), which is often used to make plastic containers for cleaning products, bath products, etc., which can withstand high temperatures of 110 degrees Celsius. It indicates that plastic lunch boxes for food can be used to hold food.
03 stands for polyvinyl chloride (PVC), which is often used to make building materials and is a toxic plastic product. "Toxic" mainly refers to the single-molecule vinyl chloride that has not been fully polymerized during the production process, as well as harmful substances in plasticizers. These two substances are easy to precipitate when encountering high temperature.
04 stands for low-density polyethylene (LDPE), which is often used to make plastic wrap, plastic film, etc. It has poor heat resistance and will melt when the temperature exceeds 110°C, leaving some plastic preparations that cannot be decomposed by the human body. Therefore, wrap the food with this plastic wrap and heat it, and the fat in the food can easily dissolve the harmful substances in the plastic wrap.
05 stands for polypropylene (PP), which is often used to make special lunch boxes for microwave ovens. It can withstand 130°C. It is the only plastic box that can be put into microwave ovens and can be reused after cleaning. Special attention should be paid to the fact that some special lunch boxes for microwave ovens are made of No. 05 PP, but the lid is made of No. 06 PS. PS has good transparency, but it is not resistant to high temperature, so it cannot be put into the microwave oven together with the box body.
06 stands for polystyrene (PS), which is often used to make bowls of instant noodle boxes and fast food boxes, and is heat-resistant and cold-resistant. But it cannot be put into the microwave oven, so as not to release chemicals due to high temperature, and it cannot be used to hold strong acid and strong alkaline substances.
07 represents other types of plastics (PC), which contain bisphenol A which is harmful to health.
