Intumescent plaster what characteristics does it have

Intumescent plaster is one of the fire protection systems. A rather wide catalogue, which includes intumescent and fireproofing materials, among which there is a precise differentiation, even if we often tend to confuse these two characteristics.

Specifically, intumescent plaster was chosen in order to provide passive protection against the effects of fire. This means trying to limit the damage to one’s home when uncontrolled flames have been spread in the environment. Counteracting the effects of a fire can be crucial. Although the flames continue to spread, it will be possible to reduce their effect, at least in part, by allowing escape manoeuvres and avoiding trapping. A key element of this protection system is the intumescent paint.

What is intumescent paint?

The term intumescence refers to the typical swelling generated by the chemical substances present in materials that boast this property, such as intumescent plaster. Once it reaches 200°C, during the carbonisation phase, the film of the paint will see the chemical agents inside activate, generating a carbony foam. Afterwards, a thickness equal to 100 times the initial thickness is formed. A system that places a real barrier between people and flames, which has the sole purpose of slowing down the spread of the fire.

Opting for intumescent paint for plaster therefore means to increase in a clear way the resistance of structures, residential and not, to fire. However, there is a clear difference compared to fireproof materials. The behaviour of these materials is in fact different. In this case, in fact, the reaction capacity of the structural element is increased, reducing the combustion capacity. A sort of preventive action, therefore.

Intumescent paint: types and regulations

The type of materials chosen for your home clearly affects the type of painting to be applied. Wood, for example, is highly combustible, which results in a particularly high rate of carbonisation. It is a material that favours the propagation of a fire, which leads to the selection of paints and intumescent plasters. In the specific case of wood, or wall panelling, a professional will advise his client to opt for intumescent and fireproof paint, given the characteristics of the basic structure.

Considering the great use of steel in the building industry and for modern windows and doors, this material should also be mentioned among the examples. Steel has great strength and ductility, but these characteristics vanish into thin air after exceeding 500°C. Once this threshold has been exceeded, the collapse of the structure will be observed very quickly. In this case too, passive protection systems such as panels, plasters or intumescent paints must be used.

The standard requires that the level of passive fire protection is indicated by the abbreviation REI (Resistance, airtightness, insulation), with a reference number on the side. This indicates the duration of minutes of fire resistance. Depending on the type of internal structure of your home, i.e. the materials used, you can opt for one class of durability or the other. Here they are all listed:

  • 15 minutes
  • 30 minutes
  • 45 minutes
  • 60 minutes
  • 90 minutes
  • 120 minutes
  • 180 minutes
  • 240 minutes

What about your house that REI has? To increase it, contact one of the best PagineGialle experts: ask now for your free quote for the application of intumescent paint.

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