1. two-pe coated steel pipes and three-pe plastic coated steel pipes are light in weight and strong in adhesion;
2. uniform coating and high toughness;
3. strong resistance to stress cracking and high impact resistance;
4. high sealing performance and strong insulation performance;
5. strong anti-chemical corrosion and waterproof performance, anti-aging;
6. good environmental protection and convenient local maintenance;
7. strong stability; the service life can reach more than 50 years.