¿Cuáles son las diferencias entre las tuberías de PE y las tuberías de HDPE??

The difference between tuberías de polietileno de alta densidad and PE pipes is a question that is often asked. parece simple, pero pocas personas lo explican claramente. Here we will systematically introduce it to you.

PE pipes are Polyethylene plastic pipes. Como el tipo de plástico más básico., PE has excellent resistance to most household and industrial chemicals. Common plastic bags, cling film, etc.. are all made of PE.

PE pipes as a whole can be classified into three types: tubos de polietileno de baja densidad (Tuberías de PEBD), tubos de polietileno de media densidad (Tuberías de PEMD), y tuberías de polietileno de alta densidad (tuberías de polietileno de alta densidad).

1. Polietileno de baja densidad (abbreviated as LDPE)

Low-density polyethylene is generally produced by high-pressure polymerization with a density of 0.9910 -0.925gramos/cm³. The molecular structure of low-density polyethylene is a linear macromolecule with many side chains. The side chains of different lengths on the main chain affect the regularity of the macromolecule arrangement, and the stacking is not tight, which hinders the crystallization of polyethylene. Por lo tanto, the crystallinity is 55% -65%. Low-density polyethylene has a low melting point and a soft texture. Las largas cadenas laterales le confieren baja viscosidad a altas velocidades de cizallamiento durante el procesamiento y alta resistencia al fundido durante el estiramiento., making it very suitable for the blown film process and mainly used in the production of agricultural films, heavy packaging films, etc..

2. Medium-density polyethylene (MDPE para abreviar)

Medium-density polyethylene (PEMD) is controlled in density by A-olefin copolymerization at medium and low pressures using an efficient catalyst

(0.926-0.940q/cm3), con una cristalinidad de 70%-80%. Debido a sus numerosas y largas cadenas laterales, density and crystallinity decrease, medium-density polyethylene has better flexibility and low-temperature properties, and its tensile strength, dureza, thermal properties, etc.. are inferior to those of high-density polyethylene. Due to the fact that copolyolefin can increase the intergranular linking chains of the crystal sheets of medium-density polyethylene, its resistance to slow cracking and long-term retention of mechanical strength are greatly improved compared to LDPE. Medium-density polyethylene can be used in the production of pressure pipes, tuberías de entrega, various containers and packaging films.

3. High-density Polyethylene (HDPE para abreviar)

Polietileno de alta densidad (PEAD) is produced by a low-pressure polymerization process, is linear, has a density of 0.94-0.965q/cm ³, has a crystallinity of 80%-95%, and is a white powder or granule. Compared with low-density polyethylene, it has fewer other sub-chains, a nearly linear structure, regular and close-packed molecules, and thus has high crystallinity, densidad alta, relative molecular mass ranging from hundreds of thousands to hundreds of thousands, y un rango estrecho de tasas de flujo de fusión. High density polyethylene has high rigidity and toughness, good mechanical strength and heat resistance, as well as good resistance to deep agents and steam penetration. High-density polyethylene has the lowest permeability among all types of polyethylene, the strongest corrosion resistance, and good rigidity, and is mainly used in the production of various pressure pipes, injection molded products, etc..

HDPE pipe is a type of PE pipe, but the performance of HDPE pipe is superior to that of ordinary PE pipe, which we can summarize as follows:

1, Different pressure resistance:

• HDPE pipes must be able to withstand certain pressures, and usually a high molecular weight and good mechanical properties PE resin is chosen, como resina HDPE, which is nine times stronger than ordinary polyethylene pipes (tubos de PE);

2, the wear resistance is different

• Entre todos los plásticos de ingeniería, HDPE has the best abrasion resistance. Cuanto mayor sea el peso molecular, the more wear-resistant the material is, even more than many metal materials (como el acero al carbono, acero inoxidable, bronce, etc.) the abrasion resistance of common PE is only one-tenth of that of HDPE;

3, Different uses

• Tuberías generales de PE (tubos de polietileno de media densidad) Son adecuados para el transporte de gas artificial gaseoso., gas natural, gas licuado de petróleo, while low-density polyethylene pipes are flexible tubes;
• tuberías de polietileno de alta densidad (tubos de polietileno de alta densidad) Se utilizan principalmente para el transporte de gas natural., municipal engineering water supply systems, indoor water supply systems of buildings, outdoor buried water supply systems and buried water supply systems in residential areas and factories, old pipeline repair, water treatment engineering pipeline systems, y tuberías de agua industriales en jardines, irrigation and other fields.
• tuberías de polietileno de alta densidad can be used as a replacement for traditional steel pipes and polyvinyl chloride drinking water pipes, which ordinary PE pipes cannot.

4，Diferentes métodos de conexión:

• Tuberías generales de PE, especially LDPE and MDPE, are often connected using mechanical fittings or quick-connect joints, which are convenient for flexible tubing and low-pressure applications.
• tuberías de polietileno de alta densidad, por otro lado, are widely recognized for their compatibility with heat fusion technology. Butt fusion and electrofusion create a seamless joint that is as strong as the pipe itself, ensuring a completely leak-proof system for high-pressure water and gas transmission.

5，Cost and economic value:

While general PE materials are generally cheaper and widely used in packaging and low-stress environments, HDPE pipes offer a higher initial investment but deliver exceptional long-term value.,

Due to their superior durability, lower maintenance needs, and extended lifespan, HDPE pipes significantly reduce replacement and operational costs over decades of use, making them highly cost-effective for major infrastructure projects.

PE pipe and HDPE pipe connection methods comparison including mechanical fittings and heat fusion technology

Proveedor

Luoyang Datang Energy Tech Co., Limitado. es un fabricante chino líder que se especializa en tuberías y accesorios de plástico de alta calidad.. Equipado con líneas de producción automatizadas de última generación y respaldado por un equipo de 200 profesionales, Ofrecemos una extensa línea de productos que comprende más de 150 types of plastic pipes and fittings designed for water supply and drainage systems, transmisión de gas, y sistemas de calefacción por suelo radiante. Nuestros principales productos incluyen tuberías y accesorios de PVC., educación física (PEAD) Tuberías y accesorios, Tuberías y accesorios de PPR, y tuberías de calefacción por suelo radiante PEX.

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