High density polyurethane foam directly buried steel pipe polyurethane insulation steel pipe can play a good anti-corrosion role because the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, which can isolate the infiltration of air and water. At the same time, its foam pores are all closed, and its water absorption is very small. The high-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be corroded by external air and water. The high-density polyethylene shell of polyurethane insulation pipes and the fiberglass shell of polyurethane insulation pipes have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be corroded by external air and water.

After years of exploration and development, Frete has grown into a backbone enterprise in the polyurethane machinery industry in Guangdong Province. We have senior electrical and mechanical engineers with 20 years of experience in polyurethane research and development, who have absorbed the technical characteristics of Italy's Kanglong and Germany's Hennecke. We integrate the achievements of polyurethane technology from various manufacturers and have strong technical strength and research and development capabilities; The company has a technical research and development department, experimental center, and other supporting teams to build Fret's core technology, cultivate independent innovation capabilities, and successfully obtain dozens of national patents; The production team can meet the production and transformation needs of different equipment in the polyurethane series.