Improper use of plastic products can also cause harm. According to reports, some plastic products have triangular signs, and numbers are marked in the triangles, and different numbers represent different materials and usage ranges. While the logo is primarily intended to facilitate sorting and recycling, it can also serve as a reference for safe use.

The meaning of the numbers in the triangle sign

1: Polyethylene terephthalate, cannot hold high-temperature water and acid-alkaline beverages.

2: High-density polyethylene, not easy to clean thoroughly, not suitable for water cups, etc.

3: Polyvinyl chloride has a low heat-resistance temperature, and may release harmful substances when decomposed at high temperature, which is not suitable for packaging food.

4: Products made of polyethylene, such as plastic wrap, plastic film, etc., produce harmful substances at high temperature, which may cause breast cancer, birth defects of newborns and other diseases after entering the human body with food.

5: Polypropylene, the only plastic box that can be placed in a microwave oven.

6: Plastic products made of polystyrene cannot be used in high temperature, strong acid and strong alkali environments.

7: Acrylonitrile-styrene resin, high safety, high transparency, resistance to falling, but poor durability.