Explanation of the Difference Between High Density Polyethylene and Low Density Polyethylene

I. Appearance difference

There is a clear difference in appearance between HDPE and LDPE. HDPE is white, achromatic or granular with a yellowish tinge, hard and tough. Low-density polyethylene is usually translucent or milky-white in appearance, soft and easy to expand and extrude.

2, the difference in physical properties

The physical properties of HDPE and LDPE are also different. The density of HDPE is about 0.941-0.965g/cm³, which corresponds to its hardness and toughness. Low-density polyethylene has a density of approximately 0.910-0.925g/cm³, and is relatively soft and easy to bend.

In addition, high-density polyethylene is more heat-resistant, acid and alkali resistant, corrosion-resistant, oxidation-resistant, suitable for making high-quality plastic bags, plastic bottles and so on. Low-density polyethylene is more flexible, breathable, suitable for making films, sealing cloth and other products.

3, the difference in application areas

In view of the different physical properties of HDPE and LDPE, they have different fields of application. High-density polyethylene is usually used to produce plastic bags, drums, bottles and other products, especially for the requirements of high-quality, high-strength applications more suitable; while low-density polyethylene is usually used to make film, plastic bags and other lightweight products.

4, the precautions

It should be noted that when using these two materials, the required material should be determined and selected according to the actual needs. In addition, when using these materials to make products, they should also be operated in accordance with the instructions of the production process. And in the process of use, care should be taken to avoid excessive heating or overcooling, so as not to affect the physical properties and service life of the material.

There are differences between HDPE and LDPE in terms of appearance, physical properties and application areas. In the process of use, it is necessary to understand these differences, choose the suitable material according to the needs, and operate in strict accordance with the production process instructions to ensure product quality and service life.