What does "triangle" on plastic bottle stand for?
Plastic is a high molecular compound synthesized by chemical means. It consists of synthetic resin, fillers, plasticizers, stabilizers, lubricants, pigments and other additives. Every plastic vessel has a number at the bottom (it is a triangle with an arrow and a number in the triangle).
No.1.
PET polyethylene terephthalate (polyester) Commonly used in: mineral water bottles, carbonated beverage bottles, etc. Usage: Heat-resistant to 65℃ and cold-resistant to -20℃. It is only suitable for warm drinks or frozen drinks. It is easy to deform when filled with high-temperature liquid or heated, and harmful substances will melt out. In addition, scientists found that after using No.1 plastic product for 10 months, DEHP, a carcinogen, may be released, which is toxic to testis. Therefore, drink bottles should be discarded when they are used up, and should not be used as water cups or storage containers to carry other items, so as to avoid causing health problems.
Note: Do not recycle hot water in beverage bottles. Can't put it in the car to bask in the sun; Do not contain alcohol, oil and other substances.
No.2.
HDPE high density polyethylene Commonly used for packing cleaning products, bath products and medicine bottles. Usage: It can be reused after careful cleaning, but these containers are usually difficult to clean, leaving the original cleaning products and becoming a hotbed of bacteria, so it is best not to recycle. Don't use it as a water cup or as a storage container for other items.
Note: It is difficult to clean thoroughly, so it is recommended not to recycle.
No.3.
PVC polyvinyl chloride Commonly used in raincoats, building materials, plastic films, plastic boxes, etc. Usage: This material has excellent plasticity and low price, so it is widely used. It can only resist heat at 81℃, and it is easy to produce harmful substances at high temperature, even releasing toxic substances in the manufacturing process. If it enters the human body with food, it may cause breast cancer, birth defects of newborns and other diseases. Containers of this material have been less used to package food. If used, never let it get heated. Difficult to clean and easy to remain, do not recycle. Do not buy drinks if they are filled.
Note: It cannot be used for food packaging.
No.4.
LDPE low density polyethylene Commonly used in: plastic wrap, plastic film, etc. Usage: The heat resistance is not strong. Generally, the qualified PE preservative film will melt when the temperature exceeds 110℃, leaving some plastic preparations that cannot be decomposed by human body. Oil in food can easily dissolve harmful substances in plastic wrap. Therefore, when food is put into the microwave oven, the wrapped plastic wrap should be removed first. Harmful substances are produced at high temperature, and when toxic substances enter the human body with food, they may cause diseases such as breast cancer and birth defects of newborns.
Note: Heat in microwave oven, and don't wrap food with plastic wrap.
No.5.
PP polypropylene Commonly used in: soybean milk bottle, yogurt bottle, juice beverage bottle, microwave oven lunch box. Usage: The common melting point is as high as 167℃. It is the only plastic box that can be safely put into microwave oven and can be reused after careful cleaning. Special attention should be paid to the fact that some microwave oven lunch boxes and boxes are indeed made of No.5 PP (special PP for microwave ovens can resist high temperature of 120℃ and low temperature of -20℃). However, due to the high manufacturing cost, the lids are generally made of No.1 PET instead of special PP. Because PET cannot withstand high temperature, it cannot be put into the microwave oven together with the box. To be on the safe side, take off the lid before putting the container into the microwave oven.
Note: Take off the lid when you put it in the microwave oven.
No. 6.
PS polystyrene Commonly used in: instant noodle boxes in bowls and fast food boxes. Usage: It is heat-resistant and cold-resistant, but it cannot be put into microwave oven, so as not to release chemicals due to high temperature (it will be released when the temperature is 70℃). And can not be used to contain strong acids (such as orange juice), strong alkaline substances, because it will decompose polystyrene which is not good for human body, and it is easy to cause cancer. Therefore, you should try to avoid packing hot food in fast food boxes.
Note: Don't cook instant noodles in bowls in the microwave oven.
No. 7.
PC other plastics Commonly used in: kettles, cups and bottles. Usage: A material which is widely used, especially in feeding bottles, and is controversial because it contains bisphenol A.. Lin Hanhua, an associate professor in the Department of Biology and Chemistry at City University of Hong Kong, said that in theory, as long as bisphenol A is completely converted into plastic structure in the process of making PC, it means that bisphenol A is completely absent from the product, let alone released.
Note: 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, be careful and pay special attention when using this plastic container.