Thermosetting materials in when heated usually decomposition out flammable gas, formed by the fire has certain prevent flame spreading ability carbonized layers, the carbonized depends on formula.

热固性材料在受热时通常分解出易燃气体，受火后形成具有一定的阻止火焰传播能力的炭化层，炭化程度取决于配方。

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The ambience has a critical effect on the characteristic of bead formed by fuse breaking of the electric copper wire in fire.

火灾中短路发生时周围的环境气氛对短路时导线上形成的熔化痕迹特征具有决定性影响。

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The fireproof cover is formed by combining a fire sealing and heat insulating device and a filter fume extractor.

防火罩由封火保温装置和过滤排烟装置两部分组合成。

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The vehicles entered beneath an archway formed by the ladders from two fire trucks with an American flag hung between them.

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