1. The thermal conductivity of rigid directly buried insulating pipe is not so high, and its thermal performance is stable. When the dusk holding capacity of rigid directly buried insulating pipe is 35-40kg/m3, the thermal conductivity is only 0.018g-0.023w/(m.k), which is about half of the EPS, and is the lowest in all the current thermal insulation data.

2. Hard directly buried insulating pipe has moisture-proof and waterproof properties. Hard directly buried insulating pipe has a closed porosity of more than 90%, which is hydrophobic material. It will not increase the thermal conductivity due to moisture absorption, and the wall will not seep.

3. Hard directly buried insulating pipe has the advantages of fire-proof, flame-retardant and high temperature resistance. Directly buried thermal insulation pipes, after adding flame retardants, become a kind of inflammable self extinguishing data. Although softening points can be up to 250 degrees Celsius, the softening points can be synthesized only at higher temperatures. In addition, directly buried thermal insulation pipes will form ash on the foam surface when they are extinguished, which will help isolate the foam below. It can effectively avoid the spread of fire. Moreover, direct buried insulating pipes do not produce harmful gases at high temperatures.

4. Because of the excellent thermal insulation performance of the directly buried heat preservation tube sheet, the thickness of the building envelope can be reduced and the indoor application area can be increased when the same heat preservation request is reached.

5. The anti-deformation ability is strong, the bad phenomenon of cracking is not easy to appear, and the final effect of finishing is excellent.

6. The structure of porosity of directly buried insulating pipe data is stable. Because it basically uses closed-hole structure, the thermal insulation performance becomes very good, and the effect of freeze-thaw resistance and sound absorption is not ordinary. The uniform service life of the rigid foam direct-buried insulation pipe insulation structure can reach more than 30 years if there is no unexpected situation. It can be achieved that the structure will not be destroyed under normal operation conditions, such as dry, wet or electrochemical corrosion, growth of insects, fungi or algae or destruction of rodents.

7. Low comprehensive price ratio. Although the unit price of rigid and directly buried insulation pipes is higher than that of other traditional insulation materials, the increased cost will be offset by a substantial reduction in heating and cooling costs.

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