The insulation properties of the insulation material is generally decided by the coefficient of thermal conductivity K value of the material itself, the so-called K-value, it is also known as the heat transfer rate to reflect the material heat conduction ability. Which is defined as a unit temperature gradient (temperature will reduces 1 for 1 m²) the heat transferred by the the thermal conduction surface in the unit time,. Unit is w / (m ² • open). Through the following chart we can directly see, the polyurethane material used for the Injection thermal profiles is the minimum value of K, less than half of PA66 nylon strip K value, the insulation performance is best, followed by plastic profiles, and finally wear article thermal profiles.