The number "2" indicates that the plastic is made of HDPE, which is commonly used as a bottle for cleaning products and shower products. Not for food packaging.
The number "3" indicates that the plastic is made of PVC. This kind of material is prone to harmful substances when it is hot, 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. Currently, containers of this material are rarely used to package food. If you are using it, don't let it get hot.

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