Abstract This study investigates the ignition by flaming firebrands of two decking slabs used in French dwellings located in Wildland–Urban Interface. The first decking slab was made of pine and the second one was a thermoplastic composed of polypropylene and calcium carbonate. Flaming firebrands were produced by heating and igniting wood chips of different shapes (square, longitudinal and rectangular) with a cone calorimeter. The firebrands generated preserved their shape during their heating. Their projected area was between 0.07 and 12.00 cm2 and their mass ranged from 0.57 mg to 2.66 g. The location of flaming firebrands, the minimal mass and the minimal number of firebrands needed to ignite the slabs were analysed in order to determine the critical conditions of ignition. The ignition of the decking slab only occurred when the firebrands were positioned at the interstices of the wooden slabs and against the leg of the thermoplastic slabs. No ignition occurred when the firebrands were located on the surface of the decking slab. A minimum mass of firebrands of 0.31 g and 0.80 g was necessary to ignite the wooden slabs and the thermoplastic ones, respectively. Less firebrands were needed to ignite wooden slabs than thermoplastic ones.

中文翻译：

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确定导致甲板板被燃烧的火种点燃的临界条件

摘要 本研究调查了位于 Wildland-Urban Interface 的法国住宅中使用的两个装饰板的燃烧火把点燃情况。第一个地板是由松木制成的，第二个是由聚丙烯和碳酸钙组成的热塑性塑料。燃烧的火把是通过用锥形量热计加热和点燃不同形状（方形、纵向和矩形）的木片来生产的。产生的火把在加热过程中保持了它们的形状。它们的投影面积在 0.07 到 12.00 cm2 之间，质量在 0.57 mg 到 2.66 g 之间。分析着火火点的位置、点燃平板所需的最小质量和最小数量的火点，以确定点火的临界条件。仅当火把放置在木板的空隙处并靠在热塑性板的腿上时，才会点燃装饰板。当火把位于铺面板的表面时，没有发生点火。分别需要最少 0.31 克和 0.80 克的火把来点燃木板和热塑性板。与热塑性塑料相比，点燃木板所需的火把更少。