For example, the number 1 stands for: pet. This kind of plastic is generally used to make beverage bottles, such as mineral water bottles and beverage bottles. The temperature resistance of this plastic is only 70 degrees, so you can't put hot water when you use it, only cold water or water with very low temperature. If the temperature is too high, it will release substances that are not good for your health.
Extended data:
Precautions:
1, plastic bottles should not be in contact with highly corrosive liquids.
2. Put the plastic bottle in a dry, ventilated and dark place.
3. When purchasing plastic tableware or aviation cup products, you should choose plastic products with PE (polyethylene) or PP (polypropylene) labels or PET labels, with few decorative patterns, colorless and tasteless, and smooth surface.
4, high temperature will release toxic substances, so first of all to reduce the use of such products, try to avoid holding high-temperature liquid.
Baidu encyclopedia-edible PP plastic bowl
Baidu encyclopedia -PET plastic bottle