The latest world development in use and production of small particles of the nanometer size created new possibilities for the fire retardancy research.

Application of modifiers in form of so called "nano-particles" in intumescent systems improves the fire retardancy and thermal insulation effectiveness of the system. The high dispersion of particles has the influence on the decomposition of intumescent systems and on the combustion process. Therefore the structure and thermal resistance of formed carbon layer are improved.

The INF has developed a new, effective intumescent system in form of a transparent wood and wood derivates coating which contain silicon compound in "nano" scale.

Effectiveness of this intumescent system in of wood and the influence of the dispersion degree of introduced silicon compound will be presented. Parameters determined with cone calorimeter tests such as time to sustained ignition, heat release rate, mass loss rate and others, will be discussed in the paper.

Keywords: intumescent system, nano particles, fire retardant, fireproofing efficiency

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