HDPE, or High-Density Polyethylene, is a type of polyethylene plastic that is known for its high density, strength, and durability. It has a higher molecular weight and a lower degree of branching than other types of polyethylene, which gives it greater strength and chemical resistance. HDPE is commonly used in applications where these properties are essential, such as in containers, pipes, geomembranes, and injection-molded products. It is also recyclable, which makes it an environmentally-friendly choice. HDPE is resistant to weathering, UV radiation, and temperature changes, making it suitable for outdoor applications.