Plastic packaging bottles are used in all walks of life because of their rich colors, easy transportation, easy processing and low cost.
You will find that there is a triangle symbol connected end to end at the bottom of the bottle.
The number between 1 and 7 is marked inside the symbol.
What is the meaning of these symbols?
The triangle symbol at the bottom of the plastic packaging bottle is the recycling mark of plastic products, which is equivalent to the "ID card" of the plastic container. It was formulated by the society of the plastics industry (now renamed Plastics Industry Association) in 1988.
This set of signs marks the plastic material identification code on the container or package, from No. 1 to No. 7, so that people can simply join the recycling work without bothering to learn the similarities and differences of various plastic materials. There are 1 ~ 7 numbers in the triangle. Each number represents a kind of plastic container. They are made of different materials and taboos.
No. 1 PET (polyethylene terephthalate)
Common mineral water bottles, carbonated beverage bottles, etc. Heat resistant to 70 ℃, easy to deform, and substances harmful to human body melt out.
No. 2 HDPE (high density polyethylene)
The containers of detergent, shampoo, shower gel, edible oil, pesticide, etc. are not thoroughly cleaned and are not recommended to be recycled.
No. 3 PVC (polyvinyl chloride)
It can resist heat at 81 ℃. At high temperature, it is easy to produce bad substances, difficult to clean and easy to remain. Do not recycle.
No. 4 LDPE (low density polyethylene)
The heat resistance is not strong. It usually melts when the temperature exceeds 110 ℃, and some plastic preparations that cannot be decomposed by the human body will be left. Do not heat food and beverages in the microwave.
It is the only plastic box that can be put into the microwave oven and can be reused after careful cleaning.
Although it is heat-resistant and cold resistant, it cannot be heated in the microwave oven, otherwise it will emit toxic substances. Nor can it be used to contain strong acids (such as orange juice) and strong alkaline substances, otherwise polystyrene harmful to human body will be decomposed.
PC is easy to release toxic substance bisphenol A at high temperature, which is harmful to human body. Do not heat when using, do not directly sun in the sun.
The above is about the meaning of the triangle symbol at the bottom of plastic packaging bottles. In fact, in recent years, plastic packaging bottles have been developing in the direction of green and environmental protection. Some plastics that are difficult to recycle will gradually withdraw from the historical stage and be replaced by new degradable materials.