Ignition and flame spread rate

Autoignition temperature, ignition time, and flame spread rate are influenced by fillers. The ignition times of various filled systems are given in Table 12.3. The data in Table 12.3 show that the results are not very precise and depend on the method used. A1(OH)3 performed best. 

2 shows the effect of carbon black on the autoignition temperature of a fluoroelastomer. Carbon black increases the autoignition temperature because it forms stable oxides on the charred surface.  

Autoignition of epoxy and phenolic composites with glass fiber, aramid and graphite was affected by the oxygen concentration to a limited degree. But with epoxy composites, neither fiber type nor concentration of oxygen had an effect on the autoignition time ( 50 s). In phenolic composites, the fiber type affected 

Filler, wt% Polymer Heat transmission rate, kW/m Refs. 

Flame persistence is reduced to 0 s by the addition of 48 wt% 86203 containing decabromodiphenyl oxide. 

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