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This study was to investigate the production of combustion toxic gases of pinus rigida specimens treated with pyrophosphoric acid (PP)/4ammonuium ion (4NH 4+ ), methylenepiperazinomethyl-bis-phosphonic acid (PIPEABP) and PIPEABP/4NH 4+ . Each pinus rigida plates was painted in three times with 15 wt% in the aqueous solution followed by drying the species at room temperature. Emission of combustion toxic gases was examined by the cone calorimeter (ISO 5660-1). First-time to peak mass loss rate (1st-TMLR peak ) treated with chemicals was delayed upto 66.7~250.0% compared to those of untreated specimens. For test pieces treated with the chemicals, the emission of peak carbon monoxide (CO peak ) values of 0.0136~0.0178% and peak carbon dioxide (CO 2 peak ) value of 0.04432~0.3648% were obtained, which were higher than those for the virgin plate. In particular, oxygen emission is much higher than the level of 15% which can be fatal to humans. Therefore, the resulting risk could be eliminated. However it is supposed that the combustion-toxicities were partially increased compared to those of virgin plate.

Emission of Carbon Monoxide and Carbon Dioxide Gases during Fire Tests of Specimens Treated with Phosphorus-Nitrogen Additives