The PERT Insulation Pipe II, officially known as "PERTⅡ Type Pre-fabricated Direct Burial Insulation Pipe," boasts features such as corrosion resistance, long service life, low hydraulic loss, excellent insulation performance, and easy and quick construction. Its thermal conductivity is less than 1% of that of ordinary steel pipes, with a temperature drop of less than 0.1℃ per kilometer. Replacing traditional steel pipes with PERTⅡ type insulation pipes at a rate of 8,000 kilometers per year can improve energy efficiency by over 20%, saving about 1 million tons of standard coal annually, reducing network water replenishment by over 10 million tons, and contributing to clean heating.

Currently, the medium transported by heating networks is mainly hot water and steam. Although commonly used steel pipes have the characteristics of withstanding high temperatures and pressures, their corrosion resistance is poor, leading to reduced heating efficiency. With the accelerated formation of rust, issues such as pipeline operation, dripping, and leakage have become commonplace. According to accident statistics collected from heating companies across the country, factors such as long-term neglect, pipeline aging, and outdated construction techniques have caused significant waste of thermal energy.

In recent years, the application and development of our country's PE-RT pipes in the field of building internal cold and hot water pipelines has been rapid, and the raw materials have also seen further progress. In 2002, the industry standard "System of PE-RT Pipeline for Cold and Hot Water Use" was released. However, at that time, the industry standard referred to the German standards "PE-RT Pipeline for High-Temperature Use – General Quality Requirements" and "PE-RT Pipeline for High-Temperature Use – Dimensions," both of which were based on the performance criteria of Type I PE-RT material. With the development of materials, the performance criteria of Type II PE-RT material have far exceeded those of the first generation, and the international standard ISO 22391 "System of PE-RT Pipeline for Cold and Hot Water Use" has also been revised and updated, adding requirements for pre-insulated Type II PE-RT buried pipelines.