1. "7" - AS (acrylonitrile-styrene resin), PC material and others. Used for pots, cups, baby bottles, etc. It is highly safe and resistant to falling, but not resistant to high temperatures. It is harmless to drink cold water, but if it is filled with hot water, it will produce substances harmful to the human body when heated. So everyone must pay more attention when using AS plastic cups.

2. "1" - PET (polyethylene terephthalate). Commonly found in mineral water bottles and beverage bottles, this material is heat-resistant to 70°C and can hold room temperature water for a short period of time. It cannot hold acidic and alkaline drinks or high-temperature liquids, and should not be exposed to the sun, otherwise it will produce toxic substances harmful to the human body.

3. "5" - PP (polypropylene). PP plastic water cups are made of polypropylene, which has good thermal stability and insulation, is safe and harmless to the human body. The product can be sterilized and sterilized at temperatures above 100°C. Without external force, it will not deform at 150°C and can be filled with boiling water without pressure.