Polyethylene has good chemical stability, and can withstand dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide, etc. at room temperature Solution. But it is not resistant to strong oxidation corrosion, such as fuming sulfuric acid, concentrated nitric acid, chromic acid and sulfuric acid mixture. The above solvents will slowly corrode polyethylene at room temperature, while at 90-100°C, concentrated sulfuric acid and concentrated nitric acid will quickly corrode polyethylene, causing it to be destroyed or decomposed. Polyethylene is prone to photo-oxidation, thermal oxidation, and ozone decomposition, and is prone to degradation under the action of ultraviolet rays. Carbon black has an excellent light shielding effect on polyethylene. After being irradiated, cross-linking, chain scission, and formation of unsaturated groups can occur.
