The article deals with the current issue of evaluation of qualitative results uncertainty of chemical analyses in the example of chromatographic analyses of specimens of accelerants from a fire place with the SPME-GC/MS technique. The suitability of this technique demonstrates with the results of alidation measurements of analytical characteristics: sensitivity, detection limits, linearity, selectivity and repeatability. It characterizes briefly the current state of knowledge in the area and applies the Bayesian theory for the unconditional "a-priori" probability of an analyte presence in a sample, P (H) of 0.5 and 0.95 for calculation estimates the "a-posteriori" conditional probability of the presence of the analyte in the sample relative to the experimental evidence, P (H / E) with the results of 0.97 and 0.98. This result can be interpreted as a high level of assurance of the hypothesis of presence of the analyte in the sample. In conclusion it is stated that the knowledge can also be applied in the field of construction not only in qualitative analyses of building materials / products, e. g, by FTIR, but also in the probability risk assessment.

This paper proposes statistical methods for evaluation of quantitative performance of building products determined by tests for objective decision during conformity assessment/certification in the fire protection field. The procedure is applicable even for other types of products, and for research / development of new material products.

This article briefly presents the results of measurements of the temperature field, the heat flux density field and chemical analyses of sampled smoke for the content of selected toxicants during large-scale fire test carried out with a passenger car in an open area. The measured values are compared with the values calculated from numerical modelling using the FDS computer software. The severity of the problems is documented by selected data from the statistics of fires of cars in the Czech Republic in the period of 2004-2013 and by the devastating effects of fires on their crew and its surroundings.

This paper summarizes the material and fire properties of solid flammable/combustible materials /substances /products, which are used as inputs for the computer numerical fire models. At the same time it gives the test standards for their determination. KEYWORDSMaterial and fire properties of flammable/combustible solid materials: density; specific heat; coefficient of thermal conductivity; thermal inertia; ignition temperature; gross heat of combustion; heat of gasification; heat of reaction; production rate of species; mass loss rate; combustion efficiency; emissivity; flame extinction coefficient; flame spread parameter; input data into mathematical models of fire; ignition; pyrolysis; test standards.

This paper describes extinguishing experiments to verify the possibility of increasing the fire-extinguishing efficiency of low-, medium-and high-pressure water mist by its charging by the electric field of high DC voltage. The experimental results confirmed the effects of the electrical voltage, the configuration of electrodes (anode, cathode), the volumetric water flow rate, water pressure and the type of mist nozzle. Higher fire-extinguishing effect of electrically-charged water mist was shown by a shorter extinguishing time, a smaller volume of water to extinguish the fire and a higher percentage of successful extinguishing attempts. Benefit: faster and more efficient fire-fighting with a smaller risk of injury of persons and smaller subsequent damage in the protected space.