HDPE (high density polyethylene): English name High Density Polyethylene, with good chemical stability, can resist erosion of most acids, alkalis, organic solutions and hot water. Electrical insulation is good, easy to weld. Mainly used in chemical, machinery, chemical, power, clothing, packaging, food and other industries. The next small series for everyone to introduce hdpe what material and the use of hdpe.
What is hdpe material?
HDPE means high-density polyethylene, which is a thermoplastic resin with high crystallinity and non-polarity. Hdpe was introduced to the market as far back as 1956, but at the time the material was far from being mature. However, with the passage of time, its process and manufacturing levels have been continuously improved, and high-density polyethylene materials are gradually accepted by the market.
Hdpe water supply pipe features
1.Reliable connection: Polyethylene pipe systems are connected by electrofusion, and the strength of the joint is higher than that of the pipe body.
2, good low-temperature impact resistance: polyethylene low temperature embrittlement temperature is extremely low, can be used safely in the temperature range of -60-60 °C. In winter construction, due to the material's good impact resistance, there will be no brittle pipe cracking.
3, good stress crack resistance: HDPE has a low notch sensitivity, high shear strength and excellent scratch resistance, resistance to environmental stress cracking performance is also very prominent.
4, good chemical resistance: HDPE pipe can resist the corrosion of a variety of chemical media, the presence of chemicals in the soil will not cause any degradation of the pipeline. Polyethylene is an electrical insulator, so it does not rot, rust or electrochemically corrode; nor does it promote the growth of algae, bacteria or fungi.
5. Anti-aging and long service life: Polyethylene pipes containing 2-2.5% of evenly distributed carbon black can be stored outdoor or used for 50 years in the open air without being damaged by ultraviolet radiation.
6, good wear resistance: HDPE pipe and steel pipe wear resistance comparison test shows that HDPE pipe wear resistance of steel pipe 4 times. In the field of slurry transportation, HDPE pipes have better wear resistance than steel pipes, which means that HDPE pipes have a longer service life and better economy.
7, good flexibility: HDPE pipe flexibility makes it easy to bend, engineering can bypass the obstacles by changing the way the pipe, in many occasions, the flexibility of the pipe can reduce the amount of pipe and reduce installation costs.
8. Small water flow resistance: The HDPE pipe has a smooth inner surface with a Manning coefficient of 0.009. The smooth performance and non-adhesive properties ensure that the HDPE pipe has a higher delivery capacity than conventional pipes while also reducing the pressure loss and energy consumption of the pipe.
9. Convenient handling: HDPE pipes are lighter than concrete pipes, galvanized pipes and steel pipes. It is easy to handle and install. The lower manpower and equipment requirements mean that the installation cost of the project is greatly reduced.
The use of hdpe
1. High wear resistance UHMW-PE has the best wear resistance in all current plastics and plastics. The higher the molecular weight, the more resistant the material is to wear, even exceeding many metallic materials (such as carbon steel, stainless steel, bronze, etc.). For example, the UHMW-PE pipe is 4-6 times longer than the steel pipe under strong corrosion and high wear conditions, and it can increase the transmission efficiency by 20%. The advantages of "energy saving, environmental protection, economy, and high efficiency" are fully demonstrated.
2. Corrosion resistance is not corrosive in lye. It can be used in concentrated hydrochloric acid at 80°C. Its performance is stable in 75% concentrated sulfuric acid and 20% nitric acid. It is also stable to seawater and liquid lotion.
3, very low coefficient of friction coefficient of static friction 0.07, good self-lubricating, is an ideal bearing, bushing, slider, lining material. The use of UHMW-PE as the friction part of the equipment not only improves wear life but also receives reed effect.
4. Impact resistance The impact resistance ranks first among plastics, and it is difficult to crack it regardless of strong external impact or internal pressure fluctuation. Its impact strength is 10 times that of nylon 66, 20 times that of polyvinyl chloride, and 8 times that of polytetrafluoroethylene. Especially at low temperatures, the impact strength reaches the highest value, and its flexibility provides extremely safe and reliable delivery systems. Protection.
5, anti-aging materials, stable performance, good anti-aging, ground, underground can be buried, 50 years without aging. According to the ASTM method (load 460MP2), the heat distortion temperature is 85°C, and the use temperature can reach 90°C. Under special conditions, it can be used at higher temperatures. UHMW-PE is an excellent toughness material, and its low temperature resistance is also very good. At low temperature of -269°C, it still has certain ductility without signs of brittle fracture. However, the coefficient of linear expansion is large and the thermal conductivity is poor. Therefore, when designing plastic products, it should be fully considered.
6, electrical properties of large volume resistance, breakdown voltage up to 50KV/MM, dielectric constant of 2.3. In a wider range of temperature and frequency, suitable for electrical engineering structural materials.
7. Sanitary non-toxic UHMW-PE material is odorless, non-toxic, odorless, non-corrosive, and has physiological inertia and physiological adaptability.
Editor's summary: What is the material of hdpe and the use of hdpe is introduced here, I hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
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