What is the density of High Density Polyethylene?

High-Density Polyethylene (HDPE) has a density range of 0.94 to 0.97 grams per cubic centimetre (g/cm³), which sets it apart from other types of polyethylene, such as Low-Density Polyethylene (LDPE) and Linear Low-Density Polyethylene (LLDPE). This higher density in HDPE is achieved through its more linear, unbranched molecular structure, which allows the polymer chains to pack tightly together. As a result, HDPE has increased crystallinity, providing enhanced rigidity, strength, and resistance to impact and abrasion.

The density of HDPE plays a crucial role in its properties. Unlike LDPE, which has a density below 0.93 g/cm³ and a more branched structure, HDPE’s dense structure makes it suitable for heavy-duty applications that require durability and robustness. Its high density also contributes to its resistance to chemicals and moisture, as well as its relatively low permeability to gases and liquids. This makes HDPE ideal for applications such as piping, storage tanks, fuel containers, and packaging, where it must withstand environmental stresses without compromising its structural integrity.

Moreover, HDPE’s density gives it a higher melting point, typically around 130°C to 135°C, which makes it suitable for applications exposed to moderate heat. This combination of density, durability, chemical resistance, and temperature tolerance makes HDPE one of the most widely used and versatile materials in industries ranging from construction and automotive to food packaging and consumer goods.