Polyurethane foam

Closed-cell purfoam, open-cell purfoam, UV protection - what's the difference? Get to know polyurethane!

Our products

Closed-cell foam

The best thermal insulation available with 100% waterproofing

Open cell foam

Excellent heat and sound insulation, for filling large hollow spaces

Polyurea UV protection

Waterproofing and protection against UV radiation in one

Our brands

What is polyurethane insulation?

Sprayed polyurethane is a plastic applied by spraying, which forms a continuous insulation, an airtight barrier on walls, roofs, main roofs, tanks, etc. Thanks to the technology, the insulation is completely customized: we create the insulation at the work site by mixing and reacting the liquid components. After mixing, the liquids react with each other very quickly, solidifying in just a few seconds during spectacular swelling. Purfoam provides excellent insulation, seals joints and can form a moisture and vapor barrier layer. We basically classify dispersed polyurethane into two categories: closed cell foam and open cell foam.

The sprayed foam is thermosetting cellular plastic insulation, its two main components are polyol and isocyanate. During the reaction, the two substances release heat, and within a few seconds a solid foam is formed, which is only sticky for a very short time.

Thermal conductivity

How much heat passes through the 1 meter thick, 1 square meter surface of the given material in 1 second, if the temperature difference between outside and inside is 1 degree Celsius. Its unit is Watt/meter*Kelvin. It is indicated by the Greek symbol lambda, the smaller the better the thermal insulation material. 

Thermal insulation ability

The thermal resistance shows the resistance of the given material to one degree of temperature. It is also called the R value, the higher it is, the better the thermal insulation material.

Closed cell foam values

The lambda value of closed-cell foam is 0.023 Watt/meter*Kelvin

Open cell foam values

Open-cell purhabé is worse: 0.034 Watt/meter*Kelvin.

For comparison: mineral wool (0.042-0.044), glass wool (0.058). 

Closed-cell foam

Closed-cell foam is the best thermal insulation available today, the unique advantage of which is that it also provides 100% waterproofing to the insulated building. Its surface is strong, compact and walkable. Our machines installed in our trucks mix the two liquid components, which we apply to the surface through a heated hose. After being blown out, the substance changes from a liquid to a solid state in a few seconds, while it swells to forty times its original volume. The structure of closed-cell foam has a tight cell structure, it is stiffer and stronger than open-cell foam, so it is also suitable for insulating slabs, flat roofs, and terraces. It can be used on any construction materials used today.

Much denser than open cell insulation, it is not easy to remove from the surface. It forms a much harder layer than open cell foam. Closed-cell material is more expensive, but performs much better.

Closed cell foam values

  • lambda value is 0.021-0.022.
  • load capacity: 250 kPa
  • density 35-55 kg/m3
  • fire protection: B2 self-extinguishing
  • packaging: 200 l 
cellular foam

Closed-cell foam uses

Zartcell foam side wall

Closed-cell foam properties

  • waterproof, airtight
  • the best thermal insulation available
  • walkable, rigid structure
  • gap-free: fills all cracks
  • can be used on all surfaces
zartcell purfoam flat sheet

Open cell foam


This type is very light and can be easily disassembled by hand. Open cells allow water vapor to enter the structure, which wets the insulation. Open-cell polyurethane foam is a good sound and heat insulator, but it is important to point out that it does not provide waterproofing. It fills the spaces and surfaces you want to insulate in a form-following, gap-free manner.

The technology is the same as for the closed-cell product: a liquid substance is sprayed onto the surface from the mixer on the truck through a heated hose. This material solidifies in the same way, in just a few seconds, but the open-cell foam swells more spectacularly, about a hundred times. Similar to the closed-cell product, the foam-like insulation is also airtight. 

Open cell foam values

  • Material density: 8-15 kg/m3
  • Thermal conductivity factor: 0.035W/mK
    (lambda value)
  • Fire protection classification: self-extinguishing, B2

Open cell foam uses

  • attic installation
  • slab structure
  • indoor side wall
  • exterior facades
  • other old spaces

Open cell foam properties

  • excellent thermal insulation
  • gap-free
  • sticks strongly
  • it doesn't collapse
  • efficient filling of larger spaces

Polyurea UV protection

If the closed-cell foam is used outside the building, the insulation must be protected from the harmful effects of the sun. We recommend a special synthetic resin for this. UV coating solutions can be used valso as a water-blocking coating and corrosion protection. The UV protective layer forms a perfect gap-sealing, continuous, durable waterproof surface without seams or expansion. The versatile use of UV protection is due to its waterproof, wear-resistant, non-slip, flexible yet high hardness properties. The special two-component reactor heats the insulating material, which enters the spray gun through heated pipes and is then blown onto the surface at a pressure of 240 bar. After application, the material solidifies in a few seconds and reaches its perfect and final physical and chemical state in 24 hours.

  • insulation of roofs and slate roofs
  • UV protection of polyurethane foams
  • internal insulation of pools
  • truck flatbeds
  • quick and easy application
  • fills in the gaps
  • in addition to waterproofing, UV protection
  • flexible, does not crack


Before the insulation, we consult with our customers about the related construction work in order to avoid damage to the insulation later. If, for example, you want to install solar panels on the flat roof, it is worth fixing their support legs before the insulation. If you plan to cover the insulated side wall or roof with plasterboard, it is worth placing the support brackets before the insulation. When insulating the socket, the fittings and pipes must be in place so that they do not have to be carved into the finished insulation, thus damaging the seamless insulation.

It is also important to discuss the surfaces to be protected in advance. During the preparation of the spray insulation, small particles of foam circulate in the air. Windows, doors, exterior parts of the building, nearby landmarks, and cars are all exposed to danger. The best solution is to cover nearby objects. Of course, for internal work, this risk is small, or covering is much simpler. When working outdoors, the direction of the wind must be taken into account before each blow. In excessively windy conditions, we stop outdoor work.

Protective equipment

Airway protection. The most important thing is to use the right protective mask. During the spraying, we ask our customers to leave the work area.

Eye protection. Appropriate eye protection protects the eyes from splashes of liquid components (e.g. during accidental spraying of reactive foam). Those performing the work and those checking it can protect themselves with goggles combined with a protective mask.

Clothing. If there is a possibility of direct contact with polyurethane components, wear suitable protective clothing. It is recommended to wear disposable overalls so that the spray does not come into contact with the skin and clothing. Always wash non-disposable clothing before wearing it again.

Glove. Safety gloves provide adequate protection. Pay attention to the size! Gloves that are too big or too small may not provide the user with adequate protection.

First aid

Health risks only occur during insulation. Polyurethane foam, once properly installed and cured, is NOT HAZARDOUS. It is therefore important that the persons in the work area wear appropriate protective equipment during work. Inhalation of the ingredients or contact with the skin can have harmful effects on the skin, eyes and lungs. into a wound. If you have come into contact with the substance, do not treat it lightly - seek medical help immediately.

Inhalation: Avoid mixing the components or inhaling the gases produced when the foam swells! If you see someone without a protective mask in the work area, warn them immediately and escort them to a place with fresh air. A high concentration of foaming agent (component B) can reduce the concentration of oxygen available for breathing. If the substance has been inhaled, symptoms may worsen several hours after inhalation.

Skin Contact: If you come in contact with chemicals containing the ingredients, shower or splash the affected area with water to clean the skin, then wash again with soap and water. Corn oil or propylene glycol may be more effective at removal than water. Remove contaminated clothing. If you have cut yourself during contact, seek emergency care immediately, as the chemical may have entered the bloodstream through the wound.

Eye contact: If the chemical gets into the eyes, flush the eyes with plenty of lukewarm water for at least 15 minutes. Get medical help as soon as possible.

Ingestion: If SPF chemical is swallowed, do not induce vomiting. Seek professional medical attention immediately.

Applications of dispersed foam insulation

Flat roof insulation with closed-cell membrane

Flat roof

Waterproofing and thermal insulation of new and already old flat roofs can also be solved, and we can also perform the insulation on existing bituminous surfaces without demolition!

Attic floor insulation

Attic floor

Since the majority of heat loss escapes through the slabs, the insulation of the attics is a particularly important topic in connection with the modernization of the building.

Attic Insulation


Uninhabited attics are usually insulated from the inside, between the rafters. If the attic is inhabited, it is insulated from the outside, after dismantling the shell.


Hall, warehouse

Shape-following thermal and waterproofing is the perfect choice for lightweight buildings. Say goodbye to condensation problems!

Stable Insulation with Purhab

Stable, barn, grain storage

Sterile and washable surface without the need for complicated fixation. Where the time factor is important, we can perform up to 1,000 m2 of insulation per day.

Facade Insulated Purfoam

Side wall

Heat and sound insulation of internal side walls, as well as foam insulation of external facades. It can be easily applied even on plastered walls.

Socket Insulation Closed-cell Purfoam

Attic floor insulation

The walkable foam layer is an excellent solution for specially shaped rooms, including stairs and mechanical systems, as it helps to insulate these areas without gaps.

Ceiling insulation

Ceiling insulation

If there is an unheated living space under your apartment (such as a basement or an underground garage), it is important to insulate the floor. Purhab is an ideal choice in every respect.

Trapezoidal sheet insulation with PU foam

Trapezoid plate

In addition to soaking, the condensation problem is the biggest fault of trapezoidal sheet buildings. Dripping steam is not only annoying, but can also cause damage to the building. 

Wave slate insulation

Wave slate

The majority of slate roofs get wet, due to the complicated fixing and layering of traditional insulation, it can be said that their insulation is only possible economically with purfoam.

Tank Insulation

Tank, container

Shape-following thermal insulation and corrosion protection of tanks with fast progress. It can even be used to insulate underground tanks. Ask for our offer for purfoam insulation!

Terrace insulation


Effective heat, water and sound insulation of terraces! The closed-cell material can be concreted, paved, or you can even build a green terrace on it. Half the thickness of traditional insulation is enough!

Request an offer!

What do you want to insulate?