Have you used a plastic bottle of used beverages as a water cup? Do you know which plastic bottles will release toxic carcinogens when placed in hot water? In fact, each plastic bottle has a small ID card - a triangular symbol, usually at the bottom of the plastic bottle. There are 1 to 7 numbers in the triangle. Each number represents a plastic bottle. They are made of different materials and have different taboos.Let me take a little knowledge of plastic bottles in science:
"No. 1" PET: mineral water bottle, carbonated beverage bottle
Drink bottles do not use hot water
Use: heat resistant to 70 ° C, only suitable for warm drinks or frozen drinks, high temperature liquid, or heating is easy to deform, there are substances harmful to the human body. Moreover, the scientists found that after 10 months of plastic products, it may release the carcinogen DEHP, which is toxic to the testes.
Therefore, if the beverage bottle is used up, it will be discarded. Do not use it as a water cup, or use it as a storage container to take other items, so as not to cause health problems.
"No. 2" HDPE: cleaning products, bath products
It is not recommended to recycle without thorough cleaning.
Use: It can be reused after careful cleaning, but these containers are usually not easy to clean, leaving the original cleaning products and turning into a hotbed of bacteria. You should not recycle them.
“No. 3” PVC: Currently rarely used for food packaging
Best not to buy
Use: This material is prone to harmful substances when it is hot, and even it will be released during the manufacturing process. When toxic substances enter the human body with food, it may cause diseases such as breast cancer and birth defects. Currently, containers of this material have been used less for packaged foods. If you are using it, don't let it get hot.
"No. 4" LDPE: plastic wrap, plastic film, etc.
The cling film is wrapped in a microwave oven on the surface of the food.
Use: The heat resistance is not strong. Generally, the qualified PE plastic wrap will have a hot melt phenomenon when the temperature exceeds 110 °C, leaving some plastic preparations that cannot be decomposed by the human body. Moreover, the food wrapped in plastic wrap is heated, and the fat in the food can easily dissolve the harmful substances in the wrap film. Therefore, when the food is placed in the microwave oven, the wrapped plastic wrap is first removed.
"No. 5" PP: microwave lunch box
Remove the cover when placing it in the microwave
Use: The only plastic case that can be placed in the microwave oven can be reused after careful cleaning. Need special attention, some microwave lunch boxes, the box is indeed made of No. 5 PP, but the cover is made of No. 1 PE, because PE can not withstand high temperature, it can not be put into the microwave together with the box. To be on the safe side, remove the lid before placing the container in the microwave oven.
"No. 6" PS: bowl of instant noodles, fast food box
Don't use microwave oven to cook instant noodles
Use: It is heat-resistant and cold-resistant, but it cannot be placed in a microwave oven to prevent the release of chemicals due to excessive temperature. And can not be used to carry strong acid (such as orange juice), strong alkaline substances, because it will break down the polystyrene that is not good for the human body, it is easy to cause cancer. Therefore, you should try to avoid using hot food boxes to pack hot food.
"No. 7" PC other categories: kettle, cup, bottle
PC gel meets pyrolysis bisphenol A
Use: A material that is used in large quantities, especially in bottles, is controversial because it contains bisphenol A. Lin Hanhua, an associate professor in the Department of Biology and Chemistry at the City University of Hong Kong, said that in theory, as long as the bisphenol A is converted into a plastic structure during the process of making the PC, it means that the product is completely free of bisphenol A, let alone release. However, if a small amount of bisphenol A is not converted into a plastic structure of PC, it may be released into food or drink. Therefore, be careful, pay special attention when using this plastic bottle.