METHOD FOR ASSESSING THE QUALITY OF FIRE PROTECTION TREATMENT OF WOOD BASED ON THE AMOUNT OF FLAMMABLE VOLATILE SUBSTANCES RELEASED DURING HEATING

The article discusses the validation of a new method for assessing the quality of fire protection treatments for wooden structures based on quantitative evaluation of volatile components released during induction heating. First, the time range and temperature exposure were determined, at which it is possible to track changes between the indicators of untreated and treated samples. For further research, two methods of applying flame retardants were selected: the method of layer-by-layer application and the method of impregnation. The experiment involved placing the sample in a cylindrical experimental chamber and exposing it to an induction soldering station for 60 seconds at a temperature of 430 °C for samples treated with the layer-bylayer method and 480 °C for samples treated with the impregnation method. The conditionality  of the selected temperatures and time is given in the article itself. Based on the results, it was concluded that the peak values are reached at 60 seconds, then (after 70 seconds) a carbonation layer of wood is formed and the readings reach a plateau, i.e. the readings change to a constant value with a slight deviation from 0.1 to 0.3 %. The indicators of volatile substances released on untreated samples are significantly higher in comparison with the treated ones. This indicates that this method of assessing the quality of flame retardant treatment can be used in forensic research.