Easy and fast application, adhesion to other materials, expansion properties and thermally technical and mechanical properties make polyurethane foam ideal for versatile use. It can be used in all stages of the construction of a building and for refurbishment. Benefits of PU foam:

  • versatile use
  • fast and easy application with a gun or tube
  • no other tools or devices are necessary
  • application speed
  • the subsequent process step can be carried out immediately after application of PU foam
  • thermal insulating properties – thermal conductivity coefficient λ approx. 0.05
  • special foam types can be used even at lower temperatures

  General application rules:

  • the substrate must be clean and stable, free of dust and grease
  • the substrate must be wetted (e.g. with a water spray) – to ensure more prominent expansion of foam and homogeneous internal structure (fig. 1)
  • before use the can with the foam must be shaken vigorously
  • foam is applied by means of a special gun or with the use of a tube connected directly to the valve
  • during application the can is held with the valve oriented downwards and the target space is filled from the bottom upwards (if tube-applied foam is used, filling the space up to 1/3 is sufficient, gun-applied foam must be filled up to 2/3) (fig. 2)
  • the foam is usually applied at temperatures in the range of +5 to +35 °C or according to the manufacturer’s instructions – to achieve the properties mentioned in the data sheet of the product
  • up to 24 hours protection from UV radiation must be ensured
  • after completion of the work you are recommended to use a PU cleaner to remove foam residues from the valve of the partly consumed can and in the case of gun-applied PU foam to use a cleaner to thoroughly clean the application gun
  • unsuitable surfaces for application of PU foam are LDPE, HDPE, PP, PTFE – polyurethane foam will not adhere to these surfaces

Fig. 1  – Influence of wetting on the foam structure OLYMPUS DIGITAL CAMERA Not wetted                       wetted Fig. 2 – Proper application procedure  

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