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What does the number on the disposable package represent

Update:05 Jul 2019
Summary:

Look carefully at the lid or bottom of the disposable p […]

Look carefully at the lid or bottom of the disposable package and you will find some digital signs. What is the meaning of this number?
The figures we see on the packing boxes are actually used for the classification of plastic recycling. Different numbers represent the identity codes of resins. Numbers 1-6 represent six specific plastics and are written in a triangle (usually consisting of three connected arrows) marked at the bottom of the bottle. Number 7 represents other plastics or mixed plastics. These numbers do not provide safety guidance or specific uses for people, nor can they be used to determine their applicability. Usually, however, these numbers have some directivity. Here is our summary of the meanings of these numbers.
No. 1 polyethylene terephthalate (PET): The plastic bottles of mineral water, fruit juice and carbonated beverage are made of it.
High Density Polyethylene (HDPE) No. 2: It is commonly used in barrels of water.
Polyvinyl chloride No. 3 (PVC): plastics used in general plastic pipes;
No. 4 polyethylene (PE): Fresh-keeping film, plastic film, etc. are not suitable for use at high temperature.
No. 5 polypropylene (PP): This is the most heat-resistant material, which is commonly used in plastic appliances heated by microwave ovens.
PS No. 6: Many milk tea cup caps now use it.
No. 7 often refers to several kinds of plastics such as polycarbonate (PC). Most infant bottles use PC as raw material.

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