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In firefighting situations, firefighters will encounter multiple flame exposures during go through the fireground several times. In this study, the effects of multiple flame exposures on thermal shrinkage and thermal protective performance of three fabrics used in firefighting clothing were investigated. The fabric surface morphology after flame exposure was obtained by a handy scanner, and further processed in ArcGis software. The thermal shrinkage of fabrics was characterized by ten shrinkage parameters and then quantified by using principal component analysis. The results showed that flame exposure frequency had influence on the thermal shrinkage of fabrics. As compared to several short-duration exposures, a long-duration continuous exposure resulted greater thermal shrinkage. The correlation analysis showed that there was no significant correlation between thermal shrinkage of the fabric and its thermal protective performance. The findings in this study indicated that the effects of multiple flame exposures on thermal shrinkage and thermal protective performance of firefighters clothing should be considered during clothing design and performance prediction.

The Effects of Multiple Flame Exposures on Thermal Shrinkage and Thermal Protective Performance of Fabrics used in Firefighter Clothing