【Popular Science on Polymers and Materials】--005 Plastic Products in Daily Life + zdl1966
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This post was last edited by ljtjbx on 2015-11-9 07:53. Nowadays, numbers from 1 to 7 are marked on plastic products; each number has its own meaning and range of application. The number 1 denotes PET, polyethylene terephthalate. Commonly found in mineral water bottles and carbonated beverage bottles; they tend to deform when heated to 70 degrees, can produce substances harmful to the human body, should not be exposed to direct sunlight, and are not suitable for storing liquids such as alcohol or oil. The number 2 denotes HDPE, high-density polyethylene. It is commonly used in the packaging of medicine bottles, cleaning products, and bath products. It cannot be used as a water cup, nor should it be reused. The number 3 denotes PVC, polyvinyl chloride. It is well known that harmful substances can be generated at high temperatures, and it is rarely used for food packaging. The number 4 represents PE, polyethylene. Commonly found in plastic wrap and film. Harmful substances are produced at high temperatures, and the intake of these substances into the body can cause breast diseases; plastic wrap should not be used in microwave ovens. The number 5 represents PP, polypropylene. Commonly found in soy milk bottles, fruit juice bottles, and microwave oven containers. It has a high melting point of 167 degrees. It is the only one that can be placed in a microwave for heating, and it can be reused. The number 6 represents PS, polystyrene. Commonly found in bowl-shaped instant noodles and fast-food containers. It cannot be used in a microwave oven; acidic or alkaline substances contained within it can release carcinogenic compounds, so it is best to avoid using fast-food containers for hot food. The number 7 represents PCs, other categories. Commonly found in kettles, travel mugs, and baby bottles. It is easy to release the harmful substance bisphenol A, which is harmful to the human body; it must not be heated or exposed to direct sunlight. It is best not to choose plastic bottles for feeding infants. Therefore, in daily life, one should always be aware of the plastic products they use and understand their appropriate applications.
Very good material, I’ve learned from it
It’s very useful; not bad at all, great
I used to put hot water in mineral water bottles before: L:L
This is pretty much the same as the original basic knowledge. . . . . . . . . . .
I took a look; wow, what does the number B10 at the bottom of the plastic bottle mean?
The label should refer to the number inside the circled triangle with an arrow. B10: the injection molding mold number used by the bottle manufacturer to produce bottles, or the serial number of the production unit or team.
“Type 1 PET water bottles, soda bottles, etc. ★ Do not reuse beverage bottles for hot water; they are only suitable for holding warm or cold drinks. Using them with high-temperature liquids or for heating can cause them to deform, and harmful substances may leach out into the body. Moreover, scientists have found that plastic item No. 1 may release the carcinogenic substance DEHP after 10 months of use, which is toxic to the testes. Therefore, once beverage bottles and the like are used up, they should be discarded; they should not be used as water cups or storage containers for other items, as doing so could lead to health problems that outweigh any potential benefits. “Type 2 HDPE? Cleaning supplies, bathroom products. ★ It is not recommended to reuse them if cleaning is not thorough; they can be reused after careful cleaning, but these containers are usually difficult to clean, and residual cleaning products can become a breeding ground for bacteria – it is best not to reuse them. “\"Type 3\" PVC is rarely used in food packaging nowadays★ It is best to avoid purchasing products made from this material, as it can produce harmful substances when exposed to high temperatures; toxic substances are released even during its production process. Once these substances enter the body through food, they may cause diseases such as breast cancer and congenital defects in newborns. Containers made of this material are now rarely used for packaging food. Do not expose it to heat when in use. “Type 4 LDPE? Plastic wrap and similar materials. ★ Do not use plastic wrap wrapped around food when placing it in the microwave oven, as its heat resistance is low. Typically, standard PE plastic wrap will melt at temperatures above 110°C, leaving behind plastic residues that cannot be broken down by the human body. Moreover, when heating food wrapped in plastic wrap, the fats in the food can easily dissolve the harmful substances contained in the plastic wrap. Therefore, before putting food in the microwave, the plastic wrap covering it must be removed first. “\"Model 5\" PP? Microwave oven meal box ★ Remove the lid before using it in the microwave; it is the only plastic container that can be used in a microwave. It can be reused after being carefully cleaned. Special attention should be paid to the fact that although some microwave oven meal containers are made of PP type 5, their lids are made of PE type 1; since PE cannot withstand high temperatures, it cannot be placed in the microwave oven together with the container body. To be safe, remove the lid from the container before putting it in the microwave. “Model 6” PS? Instant noodle bowls and fast-food containers ★ Do not use a microwave to heat bowl-shaped instant noodles; they are heat-resistant and cold-resistant, but should not be placed in a microwave as high temperatures can cause the release of chemicals. It also cannot be used with strong acids, such as orange juice, or strong alkaline substances, as this will result in the formation of polystyrene, which is harmful to the human body and can cause cancer. Therefore, you should try to avoid using fast-food containers to pack hot food. “Type 7” PC – other categories: kettles, water cups, baby bottles. These numbers tell us the chemical substances used to make the beverage bottles. 1 Polyethylene terephthalate 2 High-density polyethylene 3 Polyvinyl chloride 4 Low-density polyethylene 5 Polypropylene 6 Polystyrene 7 All other resins and mixtures not listed. We know that some of the chemicals used are toxic, and some of them can filter into plastics or end up in beverages. In many situations, you or your friends might say, “I don’t like this drink; it tastes like plastic.” ”Is this an explanation? You or your friends are drinking plastic. The most toxic among the above are numbers 3, 6, and 7. If these three numbers appear on the bottom of the bottle, never drink such beverages.
There seems to be a requirement regarding the number of times it can be recycled as well? Some can only be used once, that is, they are disposable ； Some can be used multiple times, but they are not permanent. . .