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Advantages and disadvantages of polyurethane insulation
Time:2021/10/19 16:55:55    

Advantages:

(1) For substrates of various shapes, whether it is a flat surface, a vertical surface or a top surface, whether it is a round, spherical or other irregularly shaped complex objects, it can be sprayed and foamed directly, without the need for expensive molds manufacturing costs;

(2) The shape of the foam insulation layer formed by spraying and foaming is consistent with the shape of the substrate; there is no seam, and the heat insulation effect is good; there is a dense protective skin layer on the outside of the foam layer, which can better protect the inner core material and is easy to carry out paint brushing and further repairs on the outer surface;

(3) High production efficiency, especially suitable for heat insulation treatment of large-area and special-shaped objects with fast forming speed and high production efficiency.

(4) Cohesive force: strong cohesive capacity and can be firmly bonded on the surface of concrete, masonry, wood, steel, asphalt, rubber, etc.;

(5) Thermal conductivity: it can reach 0.017-0.022W/m.k which is lower than rock wool, glass wool, polystyrene board, extruded board and other building thermal insulation materials;

(6) Water-repellent performance: the water-repellent rate is more than 95%;

(7) Sealing performance: no cavities, no joints, completely wrap the building envelope, effectively prevent wind and moisture from flowing into and out of the building through the gaps, and achieve complete sealing;

(8) Dimensional stability: dimensional stability is less than 1%, it has a certain elastic deformation ability and the elongation is greater than 5%;

(9) Constant performance: Polyurethane is an inert material, it does not react with acids and alkalis and is not a food source for insects and rodents. It can keep the material properties and thermal insulation properties constant;

(10) Wind resistance performance: Compressive strength>300Kpa, tensile strength>400Kpa, it has strong wind resistance and its foam can penetrate into the gap of the wall to increase its shear resistance.


Disadvantages:

(1) The insulation layer is a layer of foam which is not strong enough to be easily damaged by external forces, so it is necessary to build a protective layer on it;

(2) The characteristic of polyurethane foam is that it is afraid of ultraviolet rays, so it is white when it is just foamed, and it will turn into yellow after a period of sunlight.

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