The triangle symbol under the glass.

That's a plastic recycling label. The number marked on the triangle at the bottom of the plastic bottle has nothing to do with whether the bottle is safe or not. The triangle symbol is a symbol of plastic recycling. There are 1 ~ 7 numbers in the triangle, and each number represents a different material. If the product is made of several different materials, indicate the main and basic materials of the product. It is not mandatory to mark the recycling mark on plastic products. In order to facilitate the recycling of plastic products, some formal big brand enterprises have recently started to mark recycling signs. Logo meaning: "01"-PET (polyethylene terephthalate) mineral water bottles and carbonated beverage bottles are all made of this material. Dong Jinshi pointed out that beverage bottles cannot be recycled with hot water. This material is heat-resistant to 70℃ and is only suitable for warm or frozen drinks. It is easy to deform when it is filled with high-temperature liquid or heated, and substances harmful to human body are dissolved out. Moreover, scientists have found that this plastic product may release carcinogens after 10 months, which is toxic to human body. Therefore, drink bottles should be discarded when they are used up. They should not be used as drinking cups or as storage containers for other items, so as not to cause health problems. "02"-HDPE plastic containers for cleaning products and bath products, as well as plastic bags used in supermarkets and shopping malls at present, are mostly made of this material and can withstand the high temperature of 1 10℃, indicating that plastic bags for food can be used to hold food. Plastic containers containing cleaning products and bath products can be reused after careful cleaning, but these containers are usually not easy to clean, making the original cleaning products a hotbed of bacteria, and it is best not to recycle them if they are not thoroughly cleaned. According to reports, the toxic and harmful substances easily produced by plastic products made of this material come from two aspects, one is monomolecular vinyl chloride that has not been fully polymerized in the production process, and the other is harmful substances in plasticizers. These two substances are easy to precipitate when they encounter high temperature and oil, and toxic substances are easy to cause cancer after entering the human body with food. At present, containers made of this material are rarely used for packaging food. If it is in use, don't let it get hot. "04"-LDPE (low density polyethylene) preservative film, plastic film, etc. Are all made of this material. Heat resistance is not strong. Generally qualified PE plastic wrap will melt when the temperature exceeds 1 10℃, leaving some plastic preparations that cannot be decomposed by human body. Moreover, food is wrapped and heated with plastic wrap, and the oil in food can easily dissolve the harmful substances in plastic wrap. Therefore, before putting food into the microwave oven, you must first remove the wrapped plastic wrap. Plastic recycling standard "05"-PP (polypropylene) microwave lunch box is made of this material, which is resistant to high temperature 130℃ and has poor transparency. It is the only plastic box that can be put into the microwave oven and reused after careful cleaning. It should be noted that some microwave lunch boxes are made of PP 05, but the lid is PS 06. PS has good transparency, but it is not resistant to high temperature, so it can't be put in the microwave oven with the box. To be on the safe side, open the lid before putting the container in the microwave oven. "06"-PS (polystyrene) This is the material used to make instant noodle boxes in bowls and foamed fast food boxes. Heat-resistant and cold-resistant, but it can't be put into the microwave oven to avoid releasing chemicals when the temperature is too high. Moreover, it cannot be used to hold strong acids (such as orange juice) and strong alkaline substances, because it will decompose polystyrene that is not good for human body. Therefore, you should try to avoid packing hot food in fast food boxes. "07"-PC and other kinds of PCs are widely used materials, especially for making bottles, space cups and so on. It is controversial because it contains bisphenol A. Experts point out that in theory, as long as bisphenol A is completely converted into plastic structure in the process of manufacturing PC, it means that the product has no bisphenol A at all, let alone released it. However, if a small amount of bisphenol A is not converted into the plastic structure of PC, it may be released into food or drink. Therefore, special attention should be paid when using this plastic container. The higher the temperature, the more bisphenol A remaining in PC is released and the faster it is. So PC water bottles should not be used to hold hot water. If your kettle number is 07, the following methods can reduce the risk: don't heat it when using it, and don't direct it in the sun. No dishwasher or bowl dryer is needed to clean the kettle. Before the first use, wash it with baking soda powder and warm water, and dry it naturally at room temperature. If the container is injured or damaged, it is recommended to stop using it, because it is easy to hide bacteria if there are tiny pits on the surface of plastic products. Avoid reusing aging plastic appliances.