Different chemical properties
HDPE is flammable, it can continue to burn after fire, the top of the flame is yellow, its bottom is blue, when it burns, it will melt, and there will be droplets, no black smoke, and it will also emit paraffin to burn odor, while the corrosion of chemicals such as PE potassium hydroxide, nitric acid and sulfuric acid
It has a strong destructive effect on polyethylene.