One of the main raw materials of PU insulation core material is PU rigid foam combined with polyether, also known as white material, and together with polymeric MDI, they are collectively known as black and white materials. How the PU foam insulation panel insulates heat relies on closed-cell foaming, which isolates air into tiny bubble units, and achieves thermal insulation effect by reducing airflow. Currently, it is the material with the lowest thermal conductivity among all thermal insulation materials. Rigid PU foam panel possesses low thermal conductivity and excellent thermal performance. When the density is 38-42kg/m³, the thermal conductivity stands only at 0.018-0.023w/m·k. The closed cell rate of rigid PU is above 95%, making it a hydrophobic material.

It will not increase the thermal conductivity due to moisture absorption, and the wall will not easily seep water. PU is a flame-retardant material after adding flame retardant. When burning, a carbonized layer is formed on the surface, which helps isolate the underlying foam, effectively prevents the spread of fire, and produces no harmful gases at high temperatures. The pores of the PU material features a closed-cell structure, which is stable in structure, resistant to deformation, freezing and thawing, and not easy to crack, while insulating and absorbing sound, with a service life of over 30 years