Research on the Effect of Fire-smoke Resistance for Plywood Coated with Water-borne Finishing Fire Resistant Coating
The effect of fire-smoke resistance for 9mm thick plywood,which was coated with five coating ratios of 0、250、500、1 000 g/m2 and 1 500 g/m2 of water-borne finishing fire resistant coating separately,was studied via single burning item test.As the increasing of coating ratio,the heat release rate of plywood was reduced from 162 kW to 5 kW.Similarly,the total heat release of plywood was reduced from 53 MJ to 2 MJ.The smoke production rate and total smoke production of plywood specimen coated with water-borne finishing fire resistant coating were increased,mean-while the occurred time of smoke production rate peak was delayed.The occurred time of smoke production rate peak for plywood specimen coated was delayed from 9 s to 135 s compared to plywood specimen with coating ratio of 0 g/m2.To insure the classification of fire-smoke resisttant for plywood coated not lower than B1(B-s1)class,the coating ratio of water-borne finishing fire resistant should not be less than 250 g/m2 and coated unevenly.Fourier transform in-frared spectroscopy research shows that water-borne finishing fire resistant coating can form charring layer and generate non combustible gases,which are conducive to preventing fire and for people increase the opportunity of escaping from smoke environment.
water-borne finishing fire resistant coatingfire-resistancesmoke-resistancesingle burning item test
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