1.Plastic-coated pipe is a steel-plastic composite pipe made by fusing a layer of organic materials, such as polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP), or non-toxic polyvinyl chloride (PVC), with a thickness of 0.5–1.0 mm, onto the inner wall of a steel pipe. It not only retains the advantages of steel pipes, such as high strength, ease of connection, and resistance to water flow impact, but also overcomes the drawbacks of steel pipes, such as susceptibility to corrosion, contamination, and scaling when exposed to water, as well as the shortcomings of plastic pipes, such as low strength and poor fire resistance. Its design life can reach up to 50 years. The main disadvantage is that it must not be bent during installation. During operations such as hot working and electric welding cutting, the cut surface should be coated with a non-toxic room-temperature curing adhesive provided by the manufacturer.

The main specifications refer to the following ranges:

2.Threaded connection is suitable for: DN15–DN100

Grooved connection is suitable for: DN65–DN400

Bimetallic welded connection is suitable for: DN100–DN800

Flanged connection is suitable for: any diameter

Welded connection is suitable for: any diameter

3.The application scope of steel-plastic composite pipes includes:

Fire sprinkler systems and domestic water supply and drainage;

Gas extraction, slurry transport, and ventilation systems in the coal mining industry;

Chemical corrosion-resistant pipelines, which can be buried underground and transport media containing corrosive substances such as acids and alkalis without reducing the pipeline's service life;

Protection of communication cables, widely used in cable renovation projects in urban and rural areas;

Central air conditioning HVAC circulating water systems, where this pipe ensures the normal operation of the centra air conditioner water circulation system.