Generally, water cups (including plastic bottles and some glass-like bottles) have a triangle symbol at the bottom with numbers on it. The numbers in the triangle are the numbers of plastic materials. It turns out that there is a number at the bottom of each bottle (it is a triangle with an arrow, and there is a number in the triangle). If the number is "05" or above, it can be recycled. And the bigger the number, the safer it is. If it is less than "05", that is, "04" or less, or even without numbers, please do not reuse or heat it. Generally, the bottom of mineral water bottles is marked with 1 (so don't put it in the car to bask in the sun! ! ) The bottom of the plastic heat-resistant bowl paved on the surface is marked with 5; Generally, the bottom of the plastic heat-resistant cup for making tea is marked with 5; Nestle cream bottle bottom is marked with 2; The bottom of the yogurt bottle advertised by Lin Chi-ling is marked with 2.
Among them, the number 1 indicates that polyethylene terephthalate 2 is high density polyethylene, 3 is polyvinyl chloride, 4 is polyethylene, 5 is polypropylene, 6 is polystyrene and 7 is other materials.