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1. Polyethylene (PE) materials for pipes continue to gain major development trends: In the early stage of the development trend of plastic pipes, the use of polyethylene (PE) pipes is far lower than that of polyvinyl chloride (PVC) pipes. The key reason is rationality. At that time, high-performance polyethylene pipe materials were not developed and designed. Only polyethylene materials equivalent to PE63 were used. Because of the low strength, the wall of PE pipe was several times thicker than UPVC pipe under the same standard.
Not only does the material cost increase, but it can only be used on pipes with lower pressure and smaller diameter, otherwise the wall thickness is too thick to be used. However, because of the development and design of special materials for polyethylene pipes, new and high-toughness materials are emerging in endlessly. Not only PE80 products, but also PE100 products. With the upgrading of polyethylene materials, the various stresses of polyethylene pipes have increased a lot, and the wall thickness of polyethylene has become thinner and thinner, even exceeding that of PVC pipes. That way, the advantage of PVC with thinner wall thickness and low cost has long been lost.
2. The unique flexibility and weldability of the polyethylene pipe make the paving of the pipeline convenient and economical, the application is more reliable, and the main purpose is also improved.
From the cost point of view, high-grade polyethylene pipe special materials are higher than PVC pipe materials. But why are they still widely used in developed countries? It is because pipes made of high-performance polyethylene materials have many unique advantages. One is the distinctive flexibility of PE pipes. Its elongation at break is above 500, the bending radius can be as small as 20-25 times the pipe diameter, and it also has high-quality scratch resistance.
Therefore, it is very easy to move, bend and cross during paving. Polyethylene pipes have low requirements for pipe trenches. Not only can the cost of the trenches be reduced, but at the same time the pipes are not easy to be destroyed when the foundation has uneven settlement and displacement. In addition, PE pipes can be used for more convenient heat-fusion butt joints, and heat shrinkable tapes can also be used to connect large-diameter pipes.
