Polyurethane foam is one of the types of a family of polyurethane-based sealants that has been used for a long time to seal a variety of elements in the construction process.
At the time of hardening, the foam is converted into a solid substance with a porous property and a light yellow hue. The resulting material does not differ in its moisture resistance and reacts very poorly to solar ultraviolet.
The main difference between the foam and all the variations presented to the consumer is its ability to expand. The most popular is foam, which has a high degree of expansion. As a rule, it is used in those places where maximum filling of the empty space is required, followed by sealing.
In order for the material not to spread so abundantly, preference should be given to mounting foam with a more moderate coefficient of expansion. This is especially true in cases where the space to be filled does not differ in large size or fragile connecting elements are located in it. By the way, this option is more economical. If there are many openings for filling, then slightly expanding foam will be consumed 2–3 times less.
In addition to the described options, there is a foam that does not have the ability to expand. As a rule, this type is made on the basis of silicone or acrylic. The first is endowed with excellent adhesion, which facilitates interaction with absolutely any type of material. The silicone base is best manifested in working with materials that have a smooth surface (ceramics, glass and others).
After analyzing the above information, we can confidently come to the conclusion that it is impossible to independently affect the foam expansion property. The only way to achieve the desired result is to choose a foam with a medium or low coefficient of expansion. In addition, such a material is not capable of exerting pressure on its abundant presence. adjacent planes and structures, it also allows you to significantly save content in balloon of substance.
In order to achieve maximum effect during the construction or repair process, experienced builders recommend purchasing various types of sealants in advance, including mounting foam.
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