Polyethylene is not toxic. Polyethylene is usually non-toxic, but it can be used to hold food, and there is a sound when it shakes. Polyethylene can be converted into liquid when heated to a certain extent, and can be reformed into solid after cooling. If polyethylene is heated again, it can form flowing liquid again, which shows that polyethylene has good thermoplasticity and can be recycled. When polystyrene meets high temperature, it will produce toxic gas, which is very harmful to human body and even leads to cancer.

Physical properties of polyethylene:

1. Polyethylene has excellent chemical stability and can resist the corrosion of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide, potassium hydroxide and other chemicals at room temperature, but nitric acid and sulfuric acid have strong destructive effects on polyethylene;

2. Polyethylene is prone to photooxidation, thermal oxidation and ozone decomposition, and is easily degraded under the action of ultraviolet rays. Carbon black has a good shading effect on polyethylene. After irradiation, crosslinking, chain breakage and the formation of unsaturated groups will occur.