People who often use PE pipes for construction know that there are symmetrical lines of the same color on the surface of PE pipes, including blue, yellow, and red. So what does this mean?
In China's municipal pipe market, water supply pipes and gas pipes are two major application markets. The Chinese name for PE chemistry is polyethylene. PE material is widely used in the field of water supply and drainage manufacturing due to its high strength, high temperature resistance, corrosion resistance, non toxicity, and wear resistance. Because it does not rust, it is an ideal pipe material to replace ordinary iron water supply pipes; Different colored identification lines are used to distinguish the surface of PE pipes according to their purposes. The following colors represent different purposes:
Red marking line: PE mining pipe
Among all engineering plastics, HDPE has the highest wear resistance and is eye-catching. The higher the molecular weight of the material, the more wear-resistant it is, even surpassing many metal materials such as carbon steel, stainless steel, bronze, etc. The service life under strong corrosion and high wear conditions is 4-6 times that of steel pipes and 9 times that of ordinary polyethylene; And it also improves the conveying efficiency by 20%.
The flame retardant and anti-static properties are good and meet the standard requirements. The underground service life exceeds 50 years, with significant economic benefits, excellent impact resistance, wear resistance, and dual resistance effects.
Blue marking lines: PE water supply pipe, drainage pipe, fire pipe
PE sewage pipe: PE pipe for sewage, also known as high-density polyethylene pipe, is commonly referred to as HDPE in English. This type of pipe is often used as municipal engineering pipe, mainly in the sewage treatment industry. Due to its characteristics of wear resistance, acid resistance, corrosion resistance, high temperature resistance, and high pressure resistance, it has gradually replaced traditional pipes such as steel pipes and cement pipes in the market, especially because this pipe is lightweight, easy to install and move, and is the preferred choice for new materials.
PE water supply pipe: PE pipes for water supply are the replacement products of traditional steel pipes and PVC drinking water pipes. Water supply pipes must withstand a certain amount of pressure, usually using PE resin with high molecular weight and good mechanical properties, such as HDPE resin. LDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding, and difficult connection, making it unsuitable as a material for water pressure pipes. However, due to its high hygiene indicators, PE, especially HDPE resin, has become a commonly used material for producing drinking water pipes. HDPE resin has low melt viscosity, good flowability, and is easy to process, so the selection range for its melt index is also wide, usually with a MI between 0.3-3g/10min.
Yellow marking line: PE gas pipe
PE pipes for gas use are a replacement product for traditional steel pipes and polyvinyl chloride gas pipes.
Gas pipes must withstand a certain amount of pressure, usually using PE resin with high molecular weight and good mechanical properties, such as HDPE resin. HDPE resin has low tensile strength, poor pressure resistance, poor rigidity, poor dimensional stability during molding, and difficult connection, making it unsuitable as a material for water pressure pipes. However, due to its high hygiene standards, LDPE, especially LLDPE resin, has become a commonly used material for gas pipes. LDPE and LLDPE resins have low melt viscosity, good flowability, and are easy to process, so the selection range for their melt index is also wide, usually with a MI between 0.3-3g/10min.
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