What are the issues that should be paid attention to when using different plastic bottles?

Update:09-09-2020
Summary:

Every plastic bottle has a small ID-a triangular symbol […]

Every plastic bottle has a small ID-a triangular symbol, usually at the bottom of the plastic bottle. There are numbers from 1 to 7 inside the triangle. Each number represents a type of plastic bottle. They are made of different materials and there are also different contraindications.
"No. 1" PET: mineral water bottles, carbonated beverage bottles
Do not recycle beverage bottles for hot water
Use: It is heat-resistant to 70℃, 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 the human body will melt. In addition, scientists discovered that after 10 months of use for No. 1 plastic, it may release the carcinogen DEHP, which is toxic to the testis.
Therefore, throw away the beverage bottle when it is used up, and don't use it as a water cup or as a storage container for other items, so as not to cause health problems.
"No. 2" HDPE: cleaning products, bath products
It is recommended not to recycle if cleaning is not thorough
Use: It can be reused after careful cleaning, but these containers are usually not easy to clean. The original cleaning supplies remain and become a hotbed of bacteria. You'd better not recycle them.
"No. 3" PVC: currently rarely used for food packaging
Best not to buy
Use: This material is prone to produce harmful substances at high temperatures, and even releases during the manufacturing process. After the toxic substances enter the human body with food, they may cause breast cancer, birth defects and other diseases in newborns. At present, containers of this material have been less used for packaging food. If it is in use, do not let it heat up.
"No. 4" LDPE: cling film, plastic film, etc.
Do not wrap the food in the microwave oven
Use: The heat resistance is not strong. Generally, qualified PE cling film will melt when the temperature exceeds 110℃, leaving some plastic preparations that cannot be decomposed by the human body. In addition, when food is wrapped in plastic wrap and heated, the fat in the food can easily dissolve harmful substances in the plastic wrap. Therefore, when the food enters the microwave oven, the wrapped plastic wrap must be removed first.
"No. 5" PP: Microwave Lunch Box
When putting it in the microwave, remove the lid
Use: The only plastic box that can be put in a microwave oven, and can be reused after careful cleaning. Need special attention, some microwave lunch boxes, the box is indeed made of No. 5 PP, but the lid is made of No. 1 PE. Because PE cannot withstand high temperatures, it cannot be placed in the microwave together with the box. To be safe, remove the lid of the container before putting it in the microwave.
"No. 6" PS: bowl of instant noodle box, fast food box
Don't use the microwave to cook instant noodles
Use: It is heat-resistant and cold-resistant, but cannot be placed in a microwave oven to avoid the release of chemicals due to high temperature. And it cannot be used to carry strong acids (such as orange juice) and strong alkaline substances, because it will decompose polystyrene, which is not good for the human body, and easily cause cancer. Therefore, you should try to avoid using fast food boxes to pack hot food.
"No. 7" PC other categories: water bottle, water cup, milk bottle
PC glue meets heat to release bisphenol A
Use: A material that is used in large quantities, especially used in baby bottles, which is controversial because of its content of bisphenol A. Lin Hanhua, an associate professor in the Department of Biology and Chemistry of the City University of Hong Kong, said that in theory, as long as 100% of BPA is converted into a plastic structure during the production of PC, it means that the product is completely free of BPA, let alone released. 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 bottle.

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