Polyurethane foam

Modern requirements to improve the energy saving properties of buildings and structures, decrease heat loss, energy-saving enterprises made it necessary to issue different types of insulation.Polyurethane foam (PUF), among them stands out particularly wide range of applications, not only as to insulate, but also the sealing material.

Composition

The composition of the raw materials for the production of polyurethane foamincludes liquid components "a" (polyether component), and "B" (or MDI polyisocyanate) are mixed together to form a rich foam with a controlled volume increase.Adding "A" component, various additives and the additives may be adjusted properties of the resulting product over a wide range.

Scope polyurethane

foam structure is closed cell, so that the material not only has excellent thermal insulation characteristics, but almost does not absorb water and water vapor, being, in fact, and waterproofing materials.Thanks to these properties, the scope of the polyurethane foam is very diverse.

• Besides manufacturing various board materials, a variety of insulation elements of complex shape, polyurethane foam is applied directly to any construction site: as insulation and sealing material.For example, this material is commonly used for foaming openings when installing doors and windows.
• Properties foam directly dependent on the additives used in its production.For example, based on it is available for installation of foam fire doors qualities.Liquid components that make up the polyurethane by reaction between an outdoor converted into dense foam having excellent adhesive properties.Using
• directly sprayed polyurethane foam at a construction site, you can easily insulate structural elements of any configuration.In this case, the material is extremely resistant to most acids and alkalis, is not afraid of moisture, not damaged by rodents and insects.Excellent adhesion eliminates the fastening elements that solves the problem of occurrence of cold bridges.

Benefits PPU allowed him to take a huge gap in the market of insulation materials.In some applications, and it does has a monopoly position.In particular, the polyurethane foam is indispensable in the insulation of pipes, containers, tanks, settling refrigeration units.Recently developed technology of its application for the insulation of roofs with their simultaneous waterproofing.In this case, spraying polyurethane foam can be carried out directly on the old coating without their dismantling, and the resulting surface is not only repeats all the bends, but does not have any seams.

Benefits

undeniable advantages of polyurethane are known to all.To the above, I would like to add more following positive properties: the material has some good sound insulating properties, does not corrode, is harmless when used, are well utilized.

Disadvantages The disadvantages of foam include relatively high cost, which is a very serious obstacle to its wider use.Also, he is afraid of ultraviolet radiation, therefore, need protection from the direct rays of the sun.It can be protected by:

• finishing materials;
• painting;
• applying mastic.

Specifications polyurethane

• density in frozen form: from 26 to 300 kg / m3;
• number of closed cells: at least 90%;
• thermal conductivity from 0.022 - 0.03 W / m · K;
• breaking stress (compressive): 0.15-1.0 MPa (flexural): 0,35-1,9 MPa;
• water absorption: 1.0 - 5.0%;
• combustibility: difficultly (GOST 12.1.044);
• lifespan: at least 30 years;
• operating temperature range from -160 ° C to + 150 ° C.

as insulation, compared with the same for the use of materials, polyurethane foam favorably that combines the most positive aspects of their competitors, as a leader on the application.At the same time, it is relieved of most of the disadvantages inherent in other materials.Photos and videos showing every possible variety of methods of application and an impressive range of design solutions, allow to recognize the universal polyurethane foam material widely used, the use of feedback is - very positive.

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