**Figure 3.**

*HDPE applications (a) Foam [65, 66] (b) Microducts [67] (c) Pipes [68] (d) Package [69].*

products, and cases for automotive molded parts. HDPE with good dielectric property is used as electronic material in the form of microduct (**Table 2**) (**Figure 3b**). HDPE is used as a pipe due to its good mechanical properties such as impact strength, hardness, and tightness (**Tables 1** and **2**). HDPE pipes, unlike ferrous pipe systems, does not corrode, so there is no structure that will create internal resistance against the liquid flowing through it (**Figure 3c**). Therefore, it is preferred due to features such as long service life, high flow capacity, and ease of assembly. In addition to good barrier properties against oxygen and water vapor, packaging materials must also have antibacterial properties to preserve the physicochemical and organoleptic properties of food and beverages [72]. Since HDPE meets these features, it has an important use in the packaging industry (**Figure 3d**).
