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What are the properties of polyurethane insulation materials?
Time:2020/5/21 11:38:56    

Polyurethane insulation materials occupy an important position in the field of building energy-saving materials because of the following many properties:

1. Low density, low thermal conductivity and wide application temperature

Normally, the density of rigid polyurethane foam is 30-50kg / m3. This is similar to other foam insulation materials, such as EPS board, XPS board and phenolic resin foam board. However, when the same thermal insulation performance is achieved, the rigid polyurethane foam is significantly lighter than other foam materials. This means that it is easier to transport and install.Compared with other thermal insulation materials, rigid polyurethane foam has very excellent thermal insulation properties, that is, in order to achieve the same thermal insulation performance, rigid polyurethane foam is thinner than other materials: You can make a comparison. The insulation performance of 3cm thick polyurethane board is roughly equivalent to 4cm thick XPS board and 5cm thick EPS board.It can be said that the application of rigid polyurethane foam saves considerable space which is very cost-effective in areas where the insulation board is included in the building volume ratio. In addition, the temperature application range of rigid polyurethane foam is very wide: from -200 to 100 .

2. High strength

Rigid polyurethane foam has high compressive strength, adhesion and shear strength, which means that it can resist rolling and wind force, while other materials, such as glass wool, cannot do this. The problems of settlement and thinning of the rock wool insulation material will cause the U value to decrease by 10% to 20%.

3. Low moisture absorption and air tightness

Rigid foam polyurethane foam also has low moisture absorption property which means that it has a longer life than other thermal insulation materials (such as glass wool), so that its excellent heat insulation performance can be more effectively exerted.Studies have shown that when the glass wool insulation material absorbs 1% of water, its U value (a parameter to measure the insulation effect) will be reduced 86%. Rigid foam polyurethane also has air tightness property due to its high closed cell rate, this characteristic is not possessed by other thermal insulation materials such as glass wool.

4. Good fire prevention

By adjusting the formula, the rigid foam polyurethane material can meet the requirements of various standards in domestic and international. It will not have the phenomenon of melting and dripping like EPS or XPS materials and during the burning process of the rigid foam polyurethane material, a coking protective layer will be formed to inhibit the spread of combustion. In addition, metal veneer can further enhance its flame retardant properties. The performance of polystyrene foam in a fire is poor, it softens at 74 °C and melts at about 96 °C. Using polystyrene foam as the insulation material, because its softening point and melting point are very close to the temperature of the wall and roof, the thermal insulation performance of the foam will decline with time.

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