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Why can't the plastic cup be filled with hot water? What's the harm in drinking it?
It cannot be generalized. Plastic products, especially those used as tableware, are generally numbered. According to the number, the basic purpose and method of use can be judged.
2—High Density Polyethylene (HDPE)
4—Low Density Polyethylene (LDPE)
7—Other plastics (OTHER)
Mainly used for food
PET (for cola bottle beverage bottles)
PE (mostly milk bottle LDPE)
PP (for plastic cups, fast food boxes, fresh-keeping boxes)
Harmless under normal circumstances
However, it should be noted that PE will melt when the temperature exceeds 110°C, leaving some plastic preparations, which cannot be decomposed by the human body. What's more serious is that some unscrupulous manufacturers will use additives to increase the viscosity and thickness of the cling film, and these additives will precipitate certain harmful substances.
PP has a high heat-resistant temperature, so it can be used as a fast food box. The new material is transparent, harmless, free from impurities, and has high transparency.
Therefore, if the plastic cup for drinking hot water is a size 5, there is no problem. Most plastic products containing cold and warm water are No. 1, such as buckets for drinking fountains. Generally, the plastic boxes for regular microwave ovens are No. 5.