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loss of 27.22% was recorded in an OSB with a thickness of 12 mm and a density in the range of 500 to 550 kg.m − 3 , which was exposed to a radiant heat flux of 50 kW.m − 2 . The lowest weight loss of 11.91% was found in an OSB with a thickness of 18 mm and a density in the range of 550–600 kg.m − 3 , which was exposed to a radiant heat flux of 43kW.m − 2 . • The weight loss is not significantly dependent on the ignition time and the thickness of theOSB. • Critical temperature of an OSB with a thickness of 15 mm that was exposed to heat flux densities of 44 kW.m − 2 and46 kW.m − 2 had a linear character; at the heat flux densities of 48 kW.m − 2 and50kW.m − 2 , it had an initially linear course, but due to ignition, a sharp rise in temperature was noted at the upper surface of the sample. The sharp rise in temperature was caused by two effects. The first effect was a higher heat flux from the cone calorimeter to the surface of the tested sample, and the second effect was a higher reverse heat radiation from flares. Analysed parameters, such as the time-to-ignition parameter, related weight loss of the OSBs, the density and thickness of the OSBs, radiant heat flux density, distance of the ignition source from the material and determination of the critical ignition temperature with a modified arrangement of the test equipment and horizontal placement of the sample, confirmed the importance and complexity of these parameters for a better understanding of the critical ignition conditions of the OSB, as well as the combustion process. Author Contributions: Conceptualization, I.T. and M.I.; methodology, I.T.; software, I.M.; validation, I.T., M.I. and J.H.; formal analysis, I.M.; investigation, I.T.; resources, I.T. and M.I.; data curation, M.I.; writing—original draft preparation, I.T.; writing—review and editing, I.M.; project administration, I.M.; funding acquisition, I.T. All authors have read and agreed to the published version of the manuscript. Funding: This article was supported by the Cultural and Educational Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic on the basis of the project KEGA 0014UKF-4/2020 Innovative learning e-modules for safety in dual education. Data Availability Statement: Not applicable for studies not involving humans or animals. Acknowledgments: This article was supported by the Project KEGA 0014UKF-4/2020 Innovative learning e-modules for safety in dual education. Conflicts of Interest: The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript or in the decision to publish the results.
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