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Experiments of flame spread over a filter paper treated with a solution of flame retardant, NH,H,PO, or NaHCO,, were conducted in an upward opposed air flow. The flame spread rate and temperature profiles of gas phase/paper surface were examined. Except promoted flame spread with small addition of NH4%P0,, these agents retarded the flame spread rate and reduced the critical flow velocity for spread. NH,H PO decreased the pyrolysis zone temperature more than 100 K while NaHCO, decreased 2d or30 K at most. With increasing add-on rate, the flame leading edge location receded and also the flame stand-off distance increased. The leading edge practically corresponded to 1400 K isotherm tip. The slowly ascending flame temperature distribution near the leading edge, observed for NH4H2P04 addition, suggested diluted pyrolysis gas, and another type of flame temperature distribution observed for NaHCO, addition suggested inhibition effects in flame reaction zone.

Effects Of Flame Retardant On The Behavior And Temperature Profiles Of Flames Spreading Over Paper