High Density Polyethylene (HDPE) is a high-crystallinity, non-polar thermoplastic resin. The original HDPE has a milky white appearance and is somewhat translucent when viewed in thin sections. PE has excellent resistance to most chemicals used in daily life and industry. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons, and halogenated hydrocarbons. This polymer is non-hygroscopic and has good water vapor resistance, making it suitable for packaging applications. HDPE has excellent electrical properties, especially high dielectric strength, making it very suitable for wires and cables. Medium to high molecular weight grades have outstanding impact resistance, even at room temperature and down to -40°F. Material Characteristics: High Density Polyethylene is a non-toxic, odorless, and tasteless white granular material with a melting point of approximately 130°C and a relative density of 0.941-0.960. It has good heat resistance and cold resistance, good chemical stability, and also possesses high rigidity and toughness, as well as good mechanical strength. Its dielectric properties and resistance to environmental stress cracking are also quite good. Pipe Characteristics: 1. Corrosion Resistance: Capable of transporting corrosive liquids such as acids and alkalis, and can be installed in marshy or humid environments. The chemical substances in the soil will not degrade the pipes, and they will not rot, rust, or corrode. 2. Lightweight and Easy to Transport and Install: Weighs only one-eighth that of steel pipes, making it easy to handle, bend, and weld. The volume of excavation is less, and no corrosion treatment is required, resulting in fast construction speed. Coiled pipes are suitable for longer pipelines; the trench requirements for PE pipes are much lower than for steel pipes. These factors greatly reduce construction difficulty and costs. 3. Good Sanitary Performance: The material is non-toxic, has no scaling layer, and does not breed bacteria, making it suitable for drinking water pipelines. The sanitary indicators of PE pipes meet usage requirements and will not cause secondary pollution, effectively solving the problem of pipeline pollution of water sources. 4. Smooth Inner Surface with Low Energy Loss: Compared to the same metal pipes, it can transport a greater flow and save energy consumption. The equivalent roughness ratio of the inner surface is 1/20 that of steel pipes. Under the same diameter, length, and pressure, the flow capacity of PE pipes is about 30% greater than that of steel pipes. Higher transport capacity reduces pressure loss and water transport energy consumption, providing significant economic advantages. 5. High Impact Resistance and Abrasion Resistance: The lifespan of the pipes is over four times that of iron and steel pipes, with a service life of up to 50 years. 6. Significant Economic Benefits: Low cost, savings, and about one-third reduction in project costs compared to metal pipes. Small diameter pipes can be coiled, further lowering project costs. 7. Excellent Stress Cracking Resistance: The stress cracking resistance of polyethylene pipes is superior to that of steel pipes, greatly reducing the likelihood of leaks and ruptures in engineering applications, thus increasing the safety of gas transport. In practice, when some pipes crack, the cracks can rapidly expand, causing destruction over tens or even hundreds of meters instantaneously. Internationally, extensive testing has been conducted on the rapid crack propagation of plastic pipes, showing that PE pipes have a very significant advantage in resisting crack propagation. 8. Flexibility: Polyethylene pipes have excellent flexibility, allowing them to deform to a certain extent without breaking during foundation settlement or earthquakes, thereby avoiding gas leaks. In contrast, steel pipes are prone to breakage, which can lead to gas leaks and even explosions. 9. Good Sealing Performance and No Leakage: PE pipes use heat fusion and electrofusion connections, ensuring the consistency of the material and structure at the joints with the pipe body itself. The tensile strength and burst strength of the joints are both higher than those of the pipe body, effectively resisting the circumferential force generated by internal pressure and axial tensile stress, ensuring good sealing performance.