1. Different characteristics
PE characteristics: Polyethylene is a white waxy translucent material, soft and flexible, lighter than water, non-toxic, and has excellent dielectric properties. It is flammable and continues to burn after leaving the fire. Low permeability, but high permeability to organic vapors.
The transparency of polyethylene decreases with the increase of crystallinity, and increases with the increase of molecular weight at a certain crystallinity. HDPE has a melting point range of 132-135°C, and low density polyethylene has a lower melting point (112°C) and a wide range.
HDPE characteristics: HDPE is an opaque white wax-like material with light specific gravity, 0.941-0.960. It is both hard and soft, but slightly harder than the LDP. It is also slightly elongated, non-toxic and odorless.
2. Different chemical properties
PE chemical properties: polyethylene has excellent chemical stability. Under normal temperature, it can resist the corrosion of chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amine, sodium hydroxide, potassium hydroxide, etc. Nitric acid and sulfuric acid have a strong destructive effect on polyethylene.
HDPE chemical properties: flammable, can continue to burn after fire. The top of the flame is yellow and the bottom is blue. When burning, it melts. There will be droplets, no black smoke. At the same time, the smell of burning paraffin will also be emitted.
