Often, during the construction or repair there is a need in the material, which can be filled with hole crack, the junction. Such a need arises for installation of window and door frames. The best material for this will serve as a foam.
Composition
On the composition of polyurethane foam is a one-component and two-component. One-component composition is placed in a cylinder for aerosols. This polyurethane sealant.
Basis of foam is created from isocyanate and polyol in the end goes prepolymer. The chemical reaction is partly inside the package and in contact with the substance in the air, eventually arises polyurethane.
Upon exiting the balloon material in contact with the atmosphere is the foam expands in volume by 20-40 times. Due to the rapid expansion foam can fill the cavity, which are most difficult to access.
Very quickly, the foam hardens due to air humidity. For a quicker cure is possible to wet the surface. After it is applied to the foam. Within 24 hours it hardens, becoming polyurethane. The advantages of this composition - it is durable, resistant to moisture, is harmless. Since it has a plurality of pores, it acts as an excellent insulator.
How to choose the assembly foam?
High quality foam does not spread on the plane, but quickly fixed on her. The cured foam can withstand frosts and thus does not break or crack.
On what materials you can use the foam?
Apply it at work with cement, crushed stone, iron, wood, plastic. Therefore, it is used during installation of door and window frames, to create thermal insulation and sound insulation, to isolate the compounds of openings guttering.
The best brand of foam in Russia
In Russia, selling the brand ULTIMA foam. It is used:
- for all installation and construction;
- structures that need to be set with high precision and so that they are not distorted;
- to create the tight junctions.
By cons of the brand is the fact that the material is destroyed by ultraviolet rays, but this minus any foam stamps.
Benefits of foam ULTIMA:
- expands in volume to 65 L;
- secondarily expanded by 25%, i.e. structural elements securely and tightly fastened;
- when the material solidifies, it has a plurality of small pores;
- it can be used to connect the vertical joints;
- it must be applied with a gun, and it's very convenient.
species
By this, in what season it is used, the foam is divided into:
- year.
- winter.
It differs from the summer of foam so that it is used as in the heat, and in the frost. Some firms sell foam, which at relatively low temperature can be poured slits, fissures, joints to -10 ° C. Some companies sell foam, with which it is possible to work at temperatures down to -20 ° C.
Attention! Required to remember here that the temperature of the aerosol container must not fall below 0 ° C, and even better - is not lower than + 10 ° C. On the treated surface should not accumulate ice, snow, frost.
3. ALL SEASON. Its use, raspryskivaya from a cylinder at an air temperature of + 40 ° C to -10 ° C.
The foam was divided by the method of extrusion from a cylinder into:
- professional - it is extruded from the gun. The gun allows the foam extrusion speed change.
- household - it is placed in the packaging for aerosol having a tube adapter. In the cylinder, a packing-trigger and tube.
When the foam hardens, it becomes creamy. Under the influence of the sun's rays it gets dark, because it decomposes and becomes brittle, so it cover the adhesive tape, acrylic sealant. Aerosol contains a composition comprising a prepolymer, a propellant, a surfactant. When the mixture leaves the packaging, the foam hardens by moisture in the air and on surfaces.