The commonly used PE grades for HDPE pipes include PE80 and PE100. The main difference between these two grades is their ability to withstand long-term hydrostatic pressure, which is specifically reflected in the hoop stress value that can be borne within a 50-year service life. Under the condition of 20°C, the material is subjected to a long-term hydrostatic strength test. If the material can withstand a pressure range of 8.0 to 9.99 MPa, it is classified as PE80; if its bearing capacity is between 10.0 and 12.49 MPa, it is called PE100. Such classification not only facilitates engineers and technicians to make decisions when selecting materials, but also ensures the long-term operation of engineering structures such as pipelines
HDPE pipes, that is, high-density polyethylene pipes, are made of high-density polyethylene resin and have good cold resistance, flexibility, low thermal conductivity, wear resistance, heat resistance, impact resistance, noise reduction, corrosion resistance, non-conductivity, UV resistance and non-toxicity, making them perform well in various application scenarios. These properties make HDPE pipes suitable for a variety of environmental conditions, including low temperature environments, and can resist chemical corrosion and aging caused by ultraviolet rays, ensuring its long-term stable performance.
HDPE material properties include its high crystallinity, non-polarity, good chemical resistance, insulation performance, impact resistance, and its physical and mechanical properties.
1. High crystallinity: HDPE has high crystallinity and non-polar thermoplastic resin characteristics. The original HDPE is milky white in appearance and has a certain degree of translucency in thin sections.
2. Chemical resistance: HDPE has good resistance to most domestic and industrial chemicals, and can resist corrosion and dissolution by strong oxidants, acids, alkalis, salts, and organic solvents.
3. Insulation performance: HDPE has good electrical properties, especially high insulation dielectric strength, making it very suitable for wires and cables.
4. Impact resistance: Medium to high molecular weight grades of HDPE have excellent impact resistance and can maintain good mechanical properties at room temperature or even at low temperatures of -40°F.
5. Physical and mechanical properties: HDPE has better hardness, tensile strength and creep than low-density polyethylene, and has better wear resistance, electrical insulation, toughness and cold resistance. It has good chemical stability, is insoluble in any organic solvent at room temperature, and is resistant to corrosion by acids, alkalis and various salts.
