Why are there numbers on the bottom of disposable plastic cups?

Hello, the "7" at the bottom of the cup means that the material is PC, that is, plastic.

Don't pour boiling water, high temperature will promote the volatilization of bisphenol A remaining in plastic cups, and all toxic substances will be drunk into your stomach.

Look at the picture above, it is clear at a glance which material is good, which is disposable and which is toxic.

There is a triangle mark on the bottom of the cup, and the numbers inside represent the grade of the cup material.

They are as follows: No.65438 +0 PET: mineral water bottle and carbonated beverage bottle; Beverage bottles should not be recycled and filled with hot water. Usage: heat-resistant to 70℃, only suitable for filling 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 have found that plastic products may release a carcinogen DEHP after 10 months, which is harmful to testicles. Therefore, drink bottles should be discarded after use, and should not be used as cups or containers for storing other items, so as to avoid health problems.

No.2 HDPE: Cleaning products and toiletries are not thoroughly cleaned, so it is recommended not to recycle them. It can be reused after careful cleaning, but these containers are usually not easy to clean, leaving the original cleaning supplies and becoming a hotbed of bacteria. You'd better not recycle them

No.3 PVC: It is rarely used for food packaging at present, so it is best not to buy it! This material is easy to produce harmful substances at high temperature, 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 of newborns. At present, containers made of this material are rarely used for packaging food. If it is in use, don't let it get hot.

No.4 low density polyethylene: cling film, plastic film, etc. Poor heat resistance. Generally qualified PE plastic wrap will melt when the temperature exceeds 1 10℃, leaving some plastic preparations that cannot be decomposed by human body.

No.5 PP: the only plastic box that can be put into the microwave oven. It can be reused after careful cleaning. It should be noted that some microwave lunch boxes are indeed made of No.5 PP, but the lid is made of No.0 PE/kloc-0. Because PE can't withstand high temperature, it can't be put in the microwave oven with the box. For the sake of safety, please open the lid of the container before putting it into the microwave oven.

No.6 PS: instant noodle boxes and fast food boxes in bowls are heat-resistant and cold-resistant, but they cannot be put into microwave ovens to avoid releasing chemicals when the temperature is too high. And it can't be used to load strong acids (such as orange juice) and strong alkaline substances, because it will decompose polystyrene which is not beneficial to human body and is easy to cause cancer. Therefore, you should try to avoid packing hot food in fast food boxes.

Other categories of No.7 computer: kettle, water cup and milk bottle. This is the most commonly used plastic bottle now, but it is also controversial because it contains bisphenol A.

Cleaning measures to deal with bisphenol A:

The higher the temperature, the more bisphenol A remaining in PC is released, and the faster it is released. Therefore, you can't make tea with a PC water bottle in the office. Do not use a dishwasher or a bowl dryer to clean the kettle. Keep the kettle out of direct sunlight.

Before the first use, wash with baking soda and warm water, and naturally dry at room temperature. Because bisphenol A will release more during the first use and long-term use.

If the container is injured or damaged, it is recommended to stop using it, because if there are tiny pits on the surface of plastic products, it is easy to hide bacteria.

Finally, PC plastic cups are often replaced with new ones to avoid reusing aging plastic appliances.

To sum up, if you have no special interest in cups, it is recommended to use ceramic cups and glasses.

Extended data:

Plastic cups refer to disposable containers for drinks and tea. It belongs to non-degradable products and is the main source of "white pollution". The biggest users of disposable plastic cups are generally beverage shops, hot and cold beverage shops, tea shops, hotels, restaurants and coffee shops, which provide various plastic cups for take-away drinks and on-site use.

This kind of cup is a non-degradable product. Many people throw it away after drinking it, which makes this disposable plastic cup the main source of "white pollution".

Material: polystyrene? Also known as PS material, the long-term use temperature is 0 ~ 70℃. Please note that when it exceeds 60 degrees, it will deform and become smaller (shrink).

Common specifications: upper caliber 68m, height 74mm, bottom 48mm, wall thickness 100 wire, 1 1g/ piece.

References:

Baidu encyclopedia-plastic cup