Polyethylene is one of the most diverse thermoplastic materials available. The density of polyethylene determines its physical properties:   the higher the density, the stiffer the material. High-Density Polyethylene (HDPE tubes) yields a higher softening point, with higher tensile and creep resistance. Unfortunately, the reverse effect is true, and higher density properties lower impact strength, elongation, and flexibility. Common applications include: •  Small tubing to large pipe, including natural gas, sewer pipe and drainage lines •  Coatings for wire and cable •  Large applications such as fuel tanks and containers Low density polyethylene (LDPE) is puncture and tear-resistant and is frequently used for films and bags due to its low crystallinity. It can also be found in coatings to help with heat sealability and moisture barriers.