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Basic Knowledge About Three Types of PE Material (II)


LLDPE is non-toxic, tasteless and odorless, and its density is between 0.915 and 0.935g/cm3. It is a copolymer of ethylene and a small amount of high-grade α-olefin under the action of a catalyst, which is polymerized by high pressure or low pressure. The molecular structure of conventional LLDPE is characterized by its linear backbone with few or no long branches, but contains some short branches. The absence of long chain branches makes the polymer more crystalline.

Compared with LDPE, LLDPE has the advantages of high strength, good toughness, strong rigidity, heat resistance and cold resistance.


In summary, the above three materials play their respective important tasks in different types of anti-seepage projects. HDPE, LDPE and LLDPE all have good insulation, moisture-proof and anti-seepage properties, and their non-toxic, tasteless and odorless properties make them widely used in agriculture, aquaculture, artificial lakes, reservoirs, and rivers, and has been vigorously promoted and popularized by the Fisheries Bureau of the Ministry of Agriculture of China, the Shanghai Academy of Fishery Sciences, and the Institute of Fishery Machinery and Instruments.

In the medium environment of strong acid, strong base, strong oxidant and organic solvent, the material properties of HDPE and LLDPE can be well used and utilized, especially the properties of HDPE in resistance to strong acid, alkali, strong oxidation and organic solvent. The aspect is much higher than the other two materials, so HDPE anti-seepage and anti-corrosion coil has been fully utilized in the chemical and environmental protection industries.

LDPE also has good acid, alkali, salt solution characteristics, and has good extensibility, electrical insulation, chemical stability, processing performance and low temperature resistance, so it is used in agriculture, aquaculture, packaging, especially It is widely used in low temperature packaging and cable materials.

The plastic extruding machines made by KHMC mainly use HDPE for monofilament rope making. The plastic rope made by our machine is with high strength and of very good quality. 


Post time: Aug-17-2022