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What does the number on the disposable packaging box represent?

Update:24 May 2021
Summary:

Take a closer look at the lid or bottom of the disposab […]

Take a closer look at the lid or bottom of the disposable packaging box, and you will find some digital signs. What is the meaning of this number? The numbers we see on the packaging boxes are actually used for plastic recycling and sorting. The different numbers represent the ID code of the resin. The numbers 1 to 6 represent 6 specific plastics respectively, and are written in a triangle (usually composed of three connected arrows), and are marked at the bottom of the bottle. The number 7 represents other plastics or mixed plastics. These numbers are not to provide people with safety instructions or their designated purposes, nor can they be used to judge their applicability. However, these numbers usually have a certain directional nature. The following is our summary of the meaning of these numbers.
No. 1 polyethylene terephthalate (PET): Plastic bottles of mineral water, fruit juice, and carbonated drinks are made of it;
No. 2 high-density polyethylene (HDPE): It is used for common barrels of water;
No. 3 polyvinyl chloride (PVC): plastic used for general plastic pipes;
No. 4 polyethylene (PE): common cling film, plastic film, etc., not suitable for use under high temperature;
No. 5 Polypropylene (PP): This is the most heat-resistant material, and it is commonly used in microwave-heated plastic appliances;
No. 6 polystyrene (PS): it is used for the lids of many milk teas;
Number 7 often refers to several types of plastics such as polycarbonate (PC): most baby bottles use PC as a raw material.

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