The Polyethylene Exterior & Epoxy Coated Interior Composite Pipe is a type of composite pipe that uses straight seam pipes, seamless pipes, or spiral welded pipes as the base pipe. The inner wall is coated with epoxy powder approved by the Ministry of Health for drinking water hygiene safety products, and the outer wall is thermally sprayed with polyethylene powder. This type of pipe is used for large-diameter, long-distance potable water transmission in external networks.

The external polyethylene coating effectively prevents the pipeline from being corroded by external environmental factors, serving to protect the overall structure of the pipeline. Meanwhile, the inner epoxy coating provides a smooth and corrosion-resistant inner surface for the conveyed medium, ensuring the quality of the medium and extending the pipeline’s service life.

• High Hygiene and Safety: The epoxy resin complies with national hygiene standards, is non-toxic, odorless, and does not contaminate the potable water being transported. It ensures water purity and safety in industries such as food and beverage, where water quality requirements are extremely high.
• Strong Weather Resistance: The polyethylene coating material has excellent UV resistance, enabling long-term outdoor exposure without noticeable aging, cracking, or degradation. The external polyethylene layer protects the pipeline from damage caused by direct sunlight.
• Good Impact Resistance Helps Maintain Pipeline Integrity: The pipe can withstand a certain degree of external impact—whether from collisions during installation or pressure fluctuations during operation. This impact resistance helps maintain the integrity of the pipeline and reduces the risk of damage caused by external forces.

• Municipal Engineering: Widely used in urban water supply and drainage systems. For buried water supply pipelines, the outer polyethylene layer resists corrosion from soil environments, while the inner epoxy resin ensures the hygiene and safety of the water quality. In drainage pipelines, its corrosion resistance helps withstand various chemicals present in wastewater.
• Building Engineering: Used in water supply and drainage systems of buildings. Inside buildings, its excellent hygiene ensures the safe transport of potable water. Outside buildings, such as in buried inlet and drainage pipes, its weather resistance and anti-corrosion properties make it adaptable to various environmental conditions.
• Industrial Sector: In the chemical industry, it prevents pipelines from being corroded by raw chemicals and products. In the food and pharmaceutical industries, it ensures that the transported liquids meet hygiene standards and remain uncontaminated.