Its use allows thermal insulation and waterproofing in a single operation.
- - A method of external insulation without interfering with the use of the premises.
- - Lightness
- - Great adhesion on the materials normally used in construction and industry.
- - Low absorption of moisture.
- - Easy application.
Among the main characteristics of expanded polyurethane we can highlight:
- Lightweight
- Rigid
- Stable
- Resistant to chemical products
- Optimal for temperature insulation between - 200º c and 110ºc
- Easy to cut and mold
- It does not constitute food for worms and insects
- Offers resistance to fungi
- Non-aggressive to other materials
- Stable Volume
The production of polyurethane foam takes place "in-situ", in the same place of installation. To do this, mobile machines are used, which dose and mix the components. There are two types of processes: projection and casting.
Classic Brands Cool Gel and Ventilated Memory Foam 12-Inch Mattress, CertiPUR-US Certified, Twin XL
- Projection process: It consists in spraying, by means of the aforementioned machine, the mixture of the 2 highly reactive components on the surface to be isolated. Here it expands and hardens quickly. The application is made in successive layers, until reaching the final desired insulation thickness.
- Casting process: in this case, the liquid mixture of the 2 components is filtered in the cavity to be isolated, with a reactivity adjusted to the process. In a short time, the mixture expands (filling the cavity) and hardens.
TECHNICAL INFORMATION
Cell structure: The rigid polyurethane foam has a predominantly closed cell structure. The percentage of closed cells is normally above 90%.
Density: The density of rigid polyurethane foam for thermal insulation is, depending on the application, between 30 and 100 kg / m3, and higher densities can be made for special cases.
Thermal conductivity: The high thermal insulation capacity of rigid polyurethane foam is not achieved with any other known insulating material. This special feature is due to the very low thermal conductivity of the foaming gas occluded inside the cells.
Water absorption : The absorption of water by the rigid polyurethane foam occurs as a function of environmental conditions and can take place by wetting or diffusion and condensation of the steam. It is influenced fundamentally by density and dimensions. In any case, the humidity content, in practice, does not exceed 5% in volume.
Resistance to the transmission of water vapor: In applications with high vapor / temperature gradients (for example, refrigeration applications, ...) it will be necessary to place a vapor barrier on the hot side of the insulation to avoid condensation. It would also be necessary to install a vapor barrier in some cases of insulation and waterproofing of roofs, depending on the climatic zone, or if the finishing or protection of the foam is made with a product that is resistant to the passage of water vapor.
Stability / Resistance: The rigid polyurethane foam is resistant to the materials commonly used in construction. In addition, the rigid polyurethane foam is: Resistant, to a large extent, to the solvents normally used in adhesives, paints, bituminous pastes, preservatives for wood and sealants. Resistant to aging, against the action of roots and inert biochemically, for example, against molds. Stable against fuels, mineral oil and diluted acids and alkalis. Resistant against the action of the exhaust gases or the more agressive industrial atmosphere. Imputrescible, stable to the detritus, odorless and physiologically does not present disadvantages. It is chemically neutral.
Fire behavior: Rigid polyurethane foam, like all plastics, is a combustible material. However, there are polyurethane foams classified from M1 to M4, according to UNE 23727, which must be applied according to the risk to which they will be exposed.
Thermal behavior: The thermal expansion of rigid polyurethane foam due to temperature is a function of density and substrate fixation. Each material has a certain variation in its dimensions when the temperature varies. In addition, in the case of rigid polyurethane foam, there is a gas occluded in its cells that causes a pressure drop, with cold, and an overpressure, with heat. Therefore, by shrinkage a contraction occurs and by heating a dilation of the cellular structure.
Electrical properties: The rigid polyurethane foam has very low dielectric and reflection losses, as well as a very low dielectric constant. For this reason, rigid polyurethane foam is suitable for applications such as antenna coatings and radar domes.
Physical Characteristics: a Applied density (ISO R-845): from 35 to 60 kg / m3 depending on whether it is impassable or not. b) Closed cap contents (ASTM D 2856): min. 95%. c) Thermal conductivity (ASTM C 177): 0.018 to 0.020 watt / m * C. d) Resistance to compression in the direction of foam growth (ISO R-844): 2.5 to 5.5 kg / cm2. e) Absorption of water (ISO 2896): max: 2% (VOL.%). f) dimensional stability (UNI CT 242/74): max. one%. g) Behavior in the presence of fire (ASTM 1692): meets standard.