Mounting foam: types and properties

Among various multifunctional building materials for a long time, assembly foam uses. This composition is used in various spheres of repair, but not everyone knows which varieties has this product and how to use foam in the repair process. In order not to make a mistake in choosing a product, you should carefully read the number of recommendations for its use.


Mounting foam is a substance that is a fluoropolymer sealant having a special consistency that changes in the process of direct operation. Also among the components of the mixture can be found polyol and isocyanate. Products are available in special ballots, the contents of which are under pressure. In order to form a foam substance due to high pressure, propellant is applied.

A feature of this sealant is the change of aggregate state under certain conditions. This process occurs due to the contact of the foam structure with moisture in the air and on the treated surface. Thanks to this contact, the mounting foam is frozen, polymerization occurs in its composition.


Such sealant is inherent in a number of special characteristics that distinguish it from other compositions used in the construction and repair process. During operation, the foam takes into account the volume of the output of the substance that is measured in liters. This indicator is determined by the consistency of foam (releasing), as well as the number of substances that came out of the balloon.

Adhesion indicator characterizes clutch strength with substrate. The substrate can perform various surfaces, the most common brick, concrete, plastic, wood. With these materials, the clutch indicators are very high, but with such substrates, like oil surfaces, silicone, ice and synthetic materials, adhesion is practically absent.

Foaming is characterized by the process of boiling substance in the cylinder. It occurs due to the difference between atmospheric pressure and pressure inside the cylinder. When the substance comes out of the package, the formation of bubbles. Due to the presence of silicone particles, the foamed mass holds a certain form. The lack of silicones can lead to a violation of the consistency of the composition during foaming.

The existence of thorough components allows bubbles to burst, while the contents of the bubbles do not leave the foaming bunch. Naturally remove only surplus. There must always be a balance between the number of closed and open bubbles, its absence can radically change the structure and properties of the composition.

The extension is a chemical process that occurs after foaming. He is a reaction of prepolymer on the environment. As a rule, the foam substance with moisture is made, in the process of which carbon dioxide is distinguished and polyurethane compounds are created. It is at this stage that the substance expands, filling the desired sites. It is believed that manufacturers of foam should carefully control this process so that no excessive extension occurred, but many think that this property can significantly save the consumption of material during the repair process.

Secondary expansion is a process that occurs after the polymerization of the substance. Most often, this process is negative because it affects the convenience of operation of the composition. Repeated expansion occur most often due to the influence of external factors, for example, temperature increase. But an important indicator is the origin of gases that the manufacturer adds to the foam. Quality products are usually not subject to a spontaneous expansion, nor shrinkage.

Some builders were noticed that the probability of secondary expansion increases from products, which is produced in cylinders with a tube.

An important quality indicator is the viscosity of the substance. It significantly determines the consistency of the composition and the degree of influence on it of temperature factors. With a sharp difference in temperature mode, viscosity is often disturbed.

Installation foam has the special properties of thermal insulation. Its thermal conductivity is not very different from the characteristics of foam. The foaming agent is perfect for insulation, but it is usually applied to a small area or on a certain kind of seams, because it will be quite expensive to warm foam.

Depending on the type of composition, foam may have different density. It is chosen according to the type of planned work, because for different procedures, this indicator varies.

The characteristic color of the foam sealant is light yellow. If it is incorrectly to prepare the surface, then the color may vary under the influence of sunlight and becomes orange. This process significantly affects the service life of the material. To extend it, treat the material with putty or plaster.

The shelf life of products depends on the manufacturer’s company. But on average, it varies from the year to one and a half years. Upon expiration of this period, it is not recommended to use sealant, because due to the change of properties, it can present surprises during operation.


When buying a building foam it is very important to choose exactly the composition you need, because it is sometimes easy to confuse varieties of products. Therefore, it is necessary to understand in advance in the classifications of the types of mounting foam on certain features.

The first feature characterizing the sealant is the number of components in the composition.

  • Single-component compounds. These include those products that are sold in the cylinders ready to use. Such a foam has the standard characteristics presented above. The second name of disposable compositions in aerosols – household foam. For this product, a lower density of filling cylinders in comparison with professional compositions.
  • Two-component foam Includes more complex components that need to be additionally prepared before carrying out installation work. Such a foam is designed for a special construction gun.

Two-component products are capable of staring much faster than one-component analogs, also for it is characterized by a higher level of polymerization.

But since people who do not have greater building experience will be laborious and expensive to use similar compositions, they use in demand mainly among experienced masters. Such professional foam is not disposable.

Another feature of the classification of the mounting foam is its resistance to different temperatures.

Distinguish several varieties.

  • Summer. Used at the plus temperatures – from 5 to 35 degrees Celsius.
  • Winter. Used in cold weather conditions – at temperatures up to -20 degrees Celsius. Such a kind has a weaker expansion, which is its negative quality. Also to ensure the best adhesiveness of the composition with the surface, sometimes you have to wet it from the sprayer. To foam function normally, you need to monitor the balloon temperature, which should not fall below 20 degrees even in the cold season.
  • All-season products It is used in a wide range of temperatures – from 10 degrees of frost to 30 degrees of heat.

It often happens to use a foam sealant in extreme conditions, where there is a probability of fire.

According to the degree of resistance to fire, also several types of compositions are distinguished:

  • B1 – this class indicates that the composition has high resistance to open fire.
  • B2 – the indicator that the material is capable of independent damping.
  • B3 characterizes a foam that is not a heat-resistant. This group includes such a type of sealant as waterproof foam. But it does not destroy under the abundant impact of moisture and is ideal for use in bathrooms and pools.

As can be seen from the classifications provided, the mounting foam is a unique building material that can be used in almost any weather and temperature conditions.

Scope of application

Construction foam performs a number of important functions:

  • sealing;
  • sound insulation;
  • assembly (connective);
  • Heat insulating.

Each of these functions is implemented in a certain area of ​​use.

The main areas of the use of construction foam sealant are as follows:

  • Insulation of economic premises. Installation foam is often used for sealing slots when the garage gate or warehouse.
  • Fixation of doors, wall panels, windows.
  • Due to the fact that for this material is characterized by additional waterproofing and sound insulation of the room, it is often used to fill various gaps when conducting overhaul in residential areas.
  • Material is often also used as an archer mount in the interior.


Very important, both for professionals, and for inexperienced builders, has such an indicator as the consumption of the assembly sealant. This criterion directly affects the amount of material necessary for repair work, so it is important not to be mistaken when calculating the flow rate.

There are a number of factors affecting the volume of foam spent.

  • Air temperature during the operation of the composition. It can contribute to additional expansion and saving material.
  • It is important to take into account the surface material on which foam is applied. Not always the level of adhesion in sealant and various raw materials are the same. Some surface absorbs moisture better, and some kind of water pushes. All this affects the quality of the functioning of the foam composition and its consumption.
  • Features of producing sealant. The manufacturer in most cases makes a construction foam with a specific primary expansion indicator. He is obliged to point out this data on the packaging so that the buyer is more convenient to calculate the amount of the required material. Honest manufacturers have consumption indicators always coincide with reality.

The standard yield of the solution is 50 liters, which is directly proportional to filling the seam not exceeding in the width of two centimeters, and in the depth – 5 cm. An important flow rate is the area that needs to be treated with sealant. If it does not exceed 3 square meters, the consumption can be more than 7 m3, which is equivalent to 123 cylinders. But if the surface takes more than 3 m2, then the flow rate decreases.

Note when calculating such a factor as 1 cylinder. The standard indicator is 750 ml. But there may be other sizes.

Mode of application

The key step is the use of mounting foam. It is necessary to get acquainted with the instruction on the application of the composition.

Its application includes several stages.

  • If you do not want to spend a lot of time to wash your hands, put on rubber gloves. They will protect you from the inevitable skin pollution.
  • From the cylinder it is necessary to remove the lid and depending on the type of device you need to attach a special tube to the valve or wind the gun.
  • So that the consistency of the substance in the cylinder has become homogeneous, it is recommended to thoroughly shake the composition. Shake follows at least 60 seconds.
  • The surface where the sealant will be applied, should be treated with water.
  • The cylinder should be kept so that it is located under the bottom, because this is the best foam feed.
  • Moving down from top to bottom, fill the slots on 1/3. The remaining place will be filled in the process of expanding the composition.
  • When the foam fill all empty areas, it is recommended to sprinkle it with water. This will speed up the final frost process.

Drying time

The time for which foam acquires a rigid and dry texture, it can be different and depends on several indicators:

  • The manufacturer creates a foam of various quality. You can purchase products drying for different amounts of time.
  • In order not to translate the product, remember that there are different types of drying, and for each of them a certain amount of time is required. Surface layer freezes after about 20 minutes. You can use the tool to remove the foam surplus only after 4 hours, and the final hardening will occur no earlier than in a day.
  • To accelerate the time of drying, water splashes not only the basis, but also the applied composition.


There are a number of firms producing a mounting foam that occupy leading positions in the world ranking of manufacturers.

German firm Dr. Schenk Known throughout Europe and has many branches in various countries, including Russia. The company carries out the production of compositions for both internal and external work. All products combines a completely acceptable level of quality and democratic prices.

Estonian firm Penosil manufactures assembly foam with a fairly wide range of applications. Similar products are often used not only in the construction and repair of housing, but also in various industrial structures. Having high density and low expansion level, the compositions will become an excellent option for working with door surfaces.

High quality construction foam produces Belgian company Soudal. A distinctive feature of this company is the constant desire to improve its products. We regularly apply all new and new technologies that allow you to make sealant as easy as possible. The product range also affects imagination.

Do not inferior to foreign companies and brands from Russia. Company Realist Releases both professional and semi-professional formulations that can be used with different types of work and temperature modes.

Firm PROFLEX famous for the manufacture of exclusively foam sealants. Among them there is a special line of goods for external work. Many professionals in the field of construction and repair noted that the products of this company are almost identical to the quality of leading European brands.

Exceptional quality is the composition of the company Makroflex. It is noted that the foam after drying is not crumbling, it will not crumble and does not lose its original appearance for a long time.

Whatever the company you have chosen, be sure to read consumers’ feedback before buying foam. An important choice factor will be consulted with professionals.


Not all nuances of working with similar material are taken into account in the instruction manual of the assembly foam.

Significant benefit when working with a sealant and his choice will bring recommendations of professional builders:

  • The speed of the composition is significantly affected by the level of humidity in the room. If the microclimate in the dry room, then the frozen will be held longer.
  • If you fill small joints or gaps, then you will definitely buy a weak foam that will save you from the need to clean the excess material and help the most gently fill the seams.
  • Construction pistol in good condition can store indoor composition no more than 3 days.

When buying a construction foam, be sure to take a balloon in hand. Good products usually have a tangible weight, and when shaking, it is felt like the composition moves from one end of the package in another.

  • Pay attention to the appearance of the cylinder. If it has traces of deformation, this may mean that the composition is stored in inappropriate conditions.
  • Choosing a gun for mounting sealant better to stay on metal models that have a collapsible design. Such options are easy to use and at the same time stand relatively inexpensively – about 500 rubles. For many, the most priority is such a device material like stainless steel. Also pay attention to the presence of a regulator that determines the degree of supply of the foam solution.
  • If you have a big front of work with construction foam, it is recommended to purchase a special cleaner for such a material. The cleaner includes the following components: acetone, dimethyl ether and methyl ethyl ketone. All of these components are enclosed in a special aerosol cylinder, which is also available in the shape of a gun on a gun.

  • If you decide to fill out the foam of the slot, then make sure that their thickness does not exceed 5 centimeters. Otherwise, you can get too much material consumption or unpredictable change in composition, for example, excessive expansion.
  • If the frothy makeup fell on the skin or clothing, it is recommended to immediately wash the pollution, otherwise it will be much more difficult to do as material drying.
  • Despite the fact that the installation sealant does not let water, and keeps it inside its texture when absorbing, many experts recommend using foam only for interior decoration. Before deciding to exterior, analyze the features of the climate.

Taking into account all the features, recommendations for application and options for using such material as a mounting construction foam, you can apply this substance yourself in various fields and make the surrounding environment much more comfortable.

On the insulation of walls by mounting foam, see the following video.

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