Polymers 2021 , 13 , 709
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( a ) ( b ) Figure 3. ( a ) Scheme of the equipment for determination of flammability of materials at a heat flux of radiant heat of 10–50 kW.m − 2 according to [24]; ( b ) a photo of the real test equipment [31]. Legend: 1, heating cone; 2, board for sample; 3, movable arm; 4, connection point for recording experimental data. The observed factors influencing the ignition time and weight loss were • the thickness of the board material; and • the density of the radiant heat flux. 2.2.3. Determination of the Critical Ignition Temperature Determination of the critical ignition temperature was performed on a sample of OSB with a thickness of 15 mm. Test equipment according to [24] was supplemented by two thermocouples. These thermocouples were placed in the middle of the top and bottom surfaces of the board. Test samples were exposed to four selected levels of heat flux density (44, 46, 48 and 50kW.m − 2 ) for 300 s, which was repeated 5 times. 2.2.4. Statistical Processing of Data and Evaluation of Results To evaluate the influence of the above-mentioned factors on the ignition temperature and weight loss, the obtained results were subjected to statistical analysis. The obtained results of the ignition and weight loss temperatures were statistically evaluated by one- way analysis of variance (ANOVA) using the Least Significant Difference LSD test (95%, 99% detectability level) (STATGRAPHICS software version 18/19, The Plains, VA, United States), with the use of board material thickness (12, 15 and 18 mm) and radiant heat flux density (from 43 to 50 kW.m − 2 ) as influence factors. 3. Results and Discussion The course of the experiment (Figure 4) according to [24] confirmed the verified behaviour of the material in terms of the classification “reaction to fire D-s1, d0 by [10]”. D- s1, d0 means “combustible materials – medium contribution to fire, with speed of emission absent or weak during combustion” by [26]. The priority of the experiment was to monitor the critical parameters of the ignition based on the change in board thickness (Table 2).
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