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[Chemical Knowledge]：Types of Plastics You Don't Know: The Difference Between HDPE and PE

Read： 1419 Time：17months ago Source：Transform the World with Simplicity

Plastic is a common material, widely used in all walks of life. HDPE and PE are two commonly used plastic materials, but there are many differences between them. This article will introduce the difference between HDPE and PE to help readers better understand these two materials.

1. the definition of HDPE and PE

We need to understand the definition of HDPE and PE. HDPE, known as high-density polyethylene, is a high-density plastic polymerized from ethylene. It has the characteristics of high strength, high hardness, high durability and good chemical stability. PE is the abbreviation of polyethylene, which is a kind of plastic polymerized by ethylene, with good toughness and chemical stability.

2. the physical properties of HDPE and PE

Although HDPE and PE are polymerized from ethylene, their molecular structures are different, which leads to their physical properties. The specific performance is as follows:

1. Density difference

HDPE has a higher density than PE due to the special properties of its molecular structure, generally between 0.941-0.965g/cm³. The density of PE is low, generally between 0.910-0.940g/cm³.

2. Strength and hardness difference

the molecular chain structure of HDPE is more compact, so it has higher strength and hardness. It has high bending stiffness, good pressure resistance and flexibility. The molecular chain structure of PE is relatively loose, so it has good toughness and toughness, but the hardness and strength are low.

3. Temperature resistance difference

HDPE has high heat resistance and can be used at higher temperatures, generally can withstand high temperatures around 80°C. PE, on the other hand, has low temperature resistance and can only be used at room temperature.

3. HDPE and PE applications

HDPE and PE due to their differences in physical properties, the application areas are also different. The specific performance is as follows:

1. HDPE application field

HDPE material has excellent corrosion resistance, wear resistance and low temperature resistance and other properties, suitable for the production of various acid, alkali and other chemicals containers and pipelines, but also for the production of chemical equipment, marine engineering facilities and food packaging materials.

2. PE application field

PE material has excellent toughness, ductility, low temperature performance and good chemical corrosion resistance, suitable for the production of waterproof materials, cable insulation, pipes, etc.

4. Conclusion

To sum up, although HDPE and PE are plastic materials polymerized from ethylene, their physical properties and application fields are different due to different molecular chain structures. Therefore, when choosing plastic materials, we should choose materials with suitable physical properties according to the specific environment and needs.

This article introduces the difference between HDPE and PE, hoping to provide readers with some reference and help to deepen their understanding of plastic materials.