7: PC under the category of newly bought plastic cups. Common kettles, space cups and milk bottles. Department stores often use cups made of this material as gifts. It is easy to release bisphenol A, a toxic substance harmful to human body. Don't heat it when using it, and don't directly bask in the sun.
The number 5 in the triangle at the bottom of the plastic bottle: PP polypropylene
Common soybean milk bottles, sour milk bottles, fruit juice bottles, microwave lunch boxes. With a melting point as high as 167℃, it is the only plastic box that can be put into a microwave oven and can be reused after careful cleaning. It should be noted that some microwave lunch boxes are made of No.5 PP, but the cover is made of 1 PE. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box.
PC is the abbreviation of polycarbonate. Since polycarbonate does not belong to the material range of 1-6 mentioned above, the number marked in the middle of the triangle of the periodic sign is 7. At the same time, in order to facilitate the classification of circulation, the material name PC is marked next to the circulation mark.
Plastic cups are widely used materials, especially for making baby bottles and space cups. In recent years, bottles are controversial because they contain bisphenol A. Experts point out that in theory, as long as bisphenol A is completely converted into plastic structure in the process of making plastic cups, it means that the products are completely free of bisphenol A, let alone released.
However, if a small amount of bisphenol A is not converted into the plastic structure of the plastic cup, it may be released into food or drink. The higher the temperature, the more bisphenol A remains in the plastic cup, and the faster it is released. So PC water bottles should not be used to hold hot water. 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.
Heating plastic cups will precipitate some chemicals and easily breed bacteria. Although the plastic surface looks smooth, in fact, there are many cracks, which are easy to hide evil and shelter evil. In the office, people only use clean water to wash cups, and cups cannot be thoroughly cleaned and disinfected. Experts suggest that it is best to use stainless steel cups or glasses in the office and clean them every day. It is best to use detergent and wash with hot water.
In addition, the cup is affected by static electricity such as computers and cabinets, which will absorb more dust, bacteria and germs and affect health for a long time. To this end, Lu Jianguo, director of the comprehensive inspection department of the National Household Appliance Quality Supervision and Inspection Center of China Household Appliance Research Institute, suggested that it is best to provide a lid for the cup and keep it away from computers and other electrical appliances. At ordinary times, we should keep indoor air circulation, open the window for ventilation and let the dust drift away with the wind.
The first choice for drinking water should be a glass. Don't think that glass is just transparent and beautiful. Among all the cups made of materials, the glass is the healthiest.
This kind of glass contains no organic chemicals in the firing process. When people drink water or other drinks from glasses, they don't have to worry about chemicals being drunk into their stomachs. Moreover, the glass surface is smooth and easy to clean, and bacteria and dirt are not easy to breed on the glass wall. Therefore, it is the healthiest and safest for people to drink the water in the glass.