The color change analysis of historic wooden remains after fire-suppression by fluorinated chemical gases

Abstract Many wooden Chinese historic buildings are destroyed due to the ravages of frequent fire disasters. The risk highly enlarged since a long-time weathered structures in natural environment. clean fire-extinguishing technology using fluorinated chemical gases put out building rapidly at initial stage is recommended and widely used. However, gaseous hydrogen fluoride (HF) yielded during suppression process could be potential method result secondary damage its corrosiveness. Nowadays, experiments were employed clarify effect on surface buildings. Five traditional gases, H-37, FK-5-1-12, H-1323, H-2402, H-1301, used suppress fixed flame. samples, including Dao Talisman board, painting paper, chips, placed chamber. Wooden chips consist samples (acting as buildings). concentration products from monitored by gas-FTIR ABB, analysis conducted Quanta FEG SEM–EDX FEI. It observed that flame enhancement happens early varies with agents. amount F-deposited positively correlated total HF. color change mechanism comprehensive, although HF leading factor. influence depends both H 2 O concluded value L* chip much easier reduced comparing same wood grain. reduction $${\mathrm{b}}^{*}$$ b? larger than ones. suggests show shift toward blue because suppression. present study hopes provide basic acknowledgment for comprehensive understanding caused