Generally, there is a triangle around 1 Arabic numeral at the bottom of plastic products. Each number represents a different plastic raw material type, and each plastic has different limited uses according to its stability and safety. It should be noted that all plastic products may release different degrees of redundant substances under high temperature and high heat, which may cause different degrees of health hazards.
Pay special attention to the number "7", which stands for polycarbonate or other plastic products. PC is a widely used material, which is mostly used to make bottles, space cups and so on. Relatively safe, but PC materials are also controversial because of bisphenol A. The higher the temperature, the more bisphenol A is released and the faster it is. So when using, try not to heat plastic products or directly expose them to the sun.
Matters needing attention in using plastic bags
Don't pack alcoholic food in plastic bags. Alcoholic food and oily food can make lead in PVC plastic bags dissolve into food, and this plastic bag can't hold food with temperature above 50 degrees.
In addition, ordinary plastic bags can't hold food in the microwave oven. Plastic bags are easy to produce carcinogens when heated, which is very harmful to human health. Consumers should use special microwave ovens to heat plastic films. Consumers should use special food packaging bags, especially dark plastic bags, which are probably made from recycled plastics and should be resolutely avoided for food packaging.
What are the signs and signs of plastic products?
Signs and symbols of plastic products are:
1. positron emission computed tomography (positron emission computed tomography)
The number 1 stands for polyethylene terephthalate (PET for short), which generally appears at the bottom of beverage bottles. Toxic substances are easily released at high temperature. It is recommended not to be heated or placed in a very hot environment.
2. (same as high-densitypolyethylene) high-density polyethylene
Number 2 stands for high density polyethylene, abbreviated as HDPE. You can look at the bottom of skin care products. Many of them will write a 2, which is often used in some cleaning products. It is recommended not to recycle them.
3. PVC
Number 3 stands for polyvinyl chloride, which is often used to make plastic boxes, raincoats or decorative materials. Remember not to buy drinks with this label.
4. physical education class
The number 4 indicates low-density polyethylene (PE for short), which is often used to make preservative films, plastic films and other materials, and is not suitable for heating.
5. Parcel Post
The number 5 stands for polypropylene, abbreviated as PP, which is often used to make microwave lunch boxes, juice bottles and so on. Its melting point is 167℃, so it can be heated by microwave oven.
6. postscript (same as postscript); Police officer (police sergeant)
The number 6 indicates polystyrene, or PS for short, which is often used to make instant noodle boxes and fast food boxes. Also avoid high temperature heating and don't put it in the microwave oven.
7. Others
The number 7 indicates other plastic products, such as plastic bottles, plastic kettles, etc.
In addition, many plastic products now say that they do not contain BPA, and this BPA is bisphenol A. If this sentence is not mentioned, it can also be judged by the numbers at the bottom of the plastic. Generally speaking, if there is a PC logo on the bottle, the probability of bisphenol A is higher, because bisphenol A is an important raw material for manufacturing PC.
As for bisphenol S and F, at present, it is difficult for ordinary people to identify what contains these substances in their daily lives except the detection methods of professional laboratories, so the best way is to use less plastic tableware.
Signs and signs of plastic products?
As follows:
1, and the number "1" indicates that the plastic material is PET, that is, polyethylene terephthalate, common mineral water bottles and carbonated beverage bottles. , heat resistant to 70℃, easy to deform, and substances harmful to human body are dissolved out; Cars that can't be placed in the sun can't be loaded with alcohol, oil and other substances.
This marked bottle can't be filled with water after use, and bacteria and microorganisms have entered the opened bottle, which can't guarantee the hygiene of water. In addition, plastics will age and may precipitate harmful substances after repeated use. Please throw them into the recyclable bin and let it be recycled.
2. The number "2" indicates that the plastic material is HDPE, which is often used as a packaging bottle for cleaning supplies and shower supplies. It is often used in the production of food bags, and some beverage bottles are also made of this material.
The number "3" means that plastic is made of PVC. This material is easy to produce harmful substances at high temperature, and even it will be released during the manufacturing process. Toxic substances enter the human body with food, which may cause diseases such as breast cancer and birth defects of newborns.
At present, this material itself is very hard. If it is easy to process, plasticizers, especially PVC cling film, are often added. Plasticizer content is above 30%, and greasy and high-temperature food cannot be loaded.
The plastic name code and the corresponding abbreviation code are as follows:
Polyethylene terephthalate -0 1 PET such as mineral water bottles and carbonated beverage bottles.
High density polyethylene -02 HDPE, such as cleaning products and bath products.
Pvc-03 PVC, such as: some decorative materials.
Low density polyethylene -04LDPE, such as plastic film, plastic film, etc.
Polypropylene ——————05PP, such as: microwave lunch box.
What do the marks on plastic products such as PP, PE and PC mean? Which one is the safest and non-toxic?
PP is polypropylene, PE is polyethylene, and PC is other plastics. Relatively speaking, PP is heat-resistant and safer.
There are digital signs under the plastic products, as follows:
1, number 1
PET, a container made of this material, is a common plastic bottle for soft drinks, also called "Bot bottle".
Common mineral water bottles, carbonated beverage bottles, etc. Heat resistance to 70℃ is easy to deform, and substances harmful to human body are melted out. 1 Plastic products may release carcinogen DEHP after long-term use. Can't put it in the car to bask in the sun; Don't pack alcohol, oil and other substances.
Step 2: the second one
HDPE, detergent, shampoo, bath milk, edible oil, pesticides and other containers. Most of them are made of high density polyethylene. Most containers are opaque and feel like wax.
Common white medicine bottles, cleaning products, bath products. Don't use it as a cup, or as a storage container for other items. If the cleaning is not thorough, don't recycle it.
Step 3: the third one
PVC is mostly used to make water pipes, raincoats, schoolbags, building materials, plastic films, plastic boxes and other utensils.
Common raincoats, building materials, plastic films, plastic boxes, etc. Excellent plasticity and low price, so it is widely used, and can only resist heat of 865438 0℃. It is easy to produce harmful substances at high temperature and is rarely used in food packaging. It is difficult to clean, and it is easy to remain, so don't recycle it. Don't buy packaged drinks.
4, the number 4
LDPE, plastic bags everywhere are mostly made of LDPE.
Common cling film, plastic film, etc. Harmful substances will be produced at high temperature, and toxic substances may cause diseases such as breast cancer and birth defects of newborns after entering the human body with food. Don't put plastic wrap in the microwave.
5, the number 5
PP is mostly used to make buckets, trash cans, laundry baskets, baskets, microwave food containers and so on.
Common soybean milk bottles, sour milk bottles, fruit juice bottles, microwave lunch boxes. It can withstand the high temperature of 167℃, and it is the only plastic box that can be put into the microwave oven. It can be reused after careful cleaning. It should be noted that the material of some microwave lunch boxes is No.5 PP, but the lid is No.4 PE. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box.
6. Number 6
PS, because of its low water absorption, is mostly used to make building materials, toys, stationery, rollers, and cups or disposable tableware for drinks in fast food restaurants.
Common instant noodle boxes and fast food boxes in bowls. Can't put it in the microwave oven, so as not to release chemicals when the temperature is too high. After being filled with acid and alkali substances, carcinogens will decompose. Avoid packing hot food in fast food boxes. Don't cook bowls of instant noodles in the microwave oven.
No.7.7
Others. Common PC, such as kettle, space cup, milk bottle, etc. Department stores often use this kind of water cup, PA, that is, nylon, which is mostly used in fiber textiles and some household appliances and other internal products. At high temperature, PC can easily 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.
Extended data
A Method for Identifying Polypropylene, Polyethylene and Polycarbonate —— Combustion Method
According to the color of the flame and the smell and smoke when burning plastics, the flame of polyolefin raw materials is usually blue or light blue, with mild and light smell and white smoke, while most raw materials containing benzene or chlorine are prone to black smoke and strong smell after burning, so ABS is it.
In addition, for example, PE and PP have dripping phenomenon, while PVC has no dripping phenomenon, but it has self-extinguishing phenomenon.
Baidu encyclopedia-plastic
Baidu Encyclopedia-Plastic Recycling Sign