Polyurethane foam insulation board: Polyurethane foam insulation board refers to specialized factory production line, the polyurethane foam as a core material, both sides covered with some kind of non-decorative surface layer of insulation board. Surface layer is typically to increase the bond strength of polyurethane foam insulation board and base surfaces, the UV and reduce transport damage. Polyurethane foam composite insulation board: Polyurethane foam composite insulation board refers to specialized factory production line, the polyurethane foam as a core material, or both sides of the composite sheet covered with some kind of decorative surface layer. Features: 1, rigid polyurethane low thermal conductivity, good thermal performance. When rigid polyurethane density 35 ~ 40kg / m3, thermal conductivity of 0.018 ~ 0.024w / (m.k), equivalent to about half of the EPS, is the insulation material in all the lowest thermal conductivity. Building density 3.5 ~ 4KN / m3. 2, rigid polyurethane with moisture, water resistance. Rigid polyurethane closed cell ratio of above 90%, are hydrophobic material will not absorb moisture increases the thermal conductivity, the wall is not water seepage. 3, rigid polyurethane fire retardant, high temperature. After the addition of a flame retardant polyurethane, is a nonflammable, self-extinguishing material, its softening point can reach 250 degrees Celsius, will appear only at higher temperatures decomposition: In addition, polyurethane foams when burned in their carbon surface, this layer of carbon will help isolate the underlying foam. Can effectively prevent the spread of flame. Further, the polyurethane does not produce harmful gases at high temperatures. 4, since the polyurethane sheet has excellent insulation properties, achieve the same insulation requirements under, can reduce the thickness of the external structure of buildings, thereby increasing the indoor area. 5, resistance to deformation, not easy to crack, finishes stable and safe. 6, polyurethane material porosity structural stability, is essentially closed-cell structure, not only excellent thermal insulation properties, and freeze-thaw resistance, sound absorption or. The average life expectancy rigid polyurethane foam insulation structure, under normal use and maintenance conditions, can reach more than 30 years. We can do in the life of the structure under normal use conditions, in dry, wet or galvanic corrosion, and because insects, fungi or algae growth or damage due to the external factors rodents, etc., are not undermined. 7, comprehensive cost-effective. While the rigid polyurethane foam material is priced higher than the unit price of other traditional insulation materials, but the increased costs will be offset by a significant reduction in heating and cooling costs. Usage fold: The company produces a large sheet of rigid polyurethane insulation can be used in sandwich panels, central air conditioning, building wall materials, cold storage, freezer, incubator, chemical tanks, and other fields. Technical standards: Apparent density kg / m3 40-60% ≤1.5 Dimensional stability Thermal conductivity w / mk ≤0.025 compressive strength Kpa ≥300 LOI% ≥25 temperature ℃ -196 + 120 polyurethane advantages: 1: Efficient Since the thermal conductivity of polyurethane insulation blowing agent is much lower than that of air (good insulation properties), so the insulation performance of rigid polyurethane foam is superior to those materials containing only air, such as: mineral wool, fiberglass and polystyrene. Moreover, its unique closed cell and high resistance to gas diffusion makes these have superior long-term insulation properties, its thermal insulation properties of sustainable 20 - 50 years or more. 2: excellent corrosion resistance of closed-cell polyurethane foam structures and surface material used, it has superior resistance to air and water-air performance, and it can be made at the time of forming the mosaic connection structure, easy to assemble after . It requires no additional insulation moisture, eliminating many laying insulation trouble. These properties are other insulation materials can not simultaneously have. 3: Wide, light, thin wall due to the rigid polyurethane foam also acts as a structural material, making the overall structure is light weight, span, the advantages of high load. Compared with other insulation materials, polyurethane foam has the best thermal insulation. Thus, thinner polyurethane sandwich material to meet the relevant provisions on building energy consumption limits, thus allowing the use of thinner plates are built to save building space. 4: stable quality, high production efficiency now, in the case of a sharp rise in demand for polyurethane sandwich panels factory production line, in addition to convenient control quality, the more it brings a good economy and competitiveness. 5: The weather is good, easy to install polyurethane sandwich panels prefabricated in the factory after, it can be directly used for construction and installation, no additional step quick construction. And without taking into account the weather changes, according to plan production. Disadvantage of polyurethane: 1: insulation board type formula, the ratio of messy, unstable, resulting in poor physical stability of the plate, the insulation effect is not good; 2: Spray type workability unresolved, it is difficult to ensure project quality.