. The Effect of two flame retardants on particulate and residue production. Fireproofing agents; Prescribed burning; Forest management. Retardants and Smoke Production Laboratory studies have shown that some retardants, such as diammonium phosphate (DAP), apparently polymerize the These polymerized tars might lead to the in- crease in smoke. For example, Eickner and Schaffer3 found that the most effective fire retardant chemicals, DAP and ZnCi2, greatly increased smoke production in tests on Douglas-fir plywood. Other chemicals tested showed a decrease in smoke density. They al- so foun
. The Effect of two flame retardants on particulate and residue production. Fireproofing agents; Prescribed burning; Forest management. Retardants and Smoke Production Laboratory studies have shown that some retardants, such as diammonium phosphate (DAP), apparently polymerize the These polymerized tars might lead to the in- crease in smoke. For example, Eickner and Schaffer3 found that the most effective fire retardant chemicals, DAP and ZnCi2, greatly increased smoke production in tests on Douglas-fir plywood. Other chemicals tested showed a decrease in smoke density. They al- so found that chemicals previously suspected of promoting postglowing reactions, such as sodium dichromate and ammonium sulfate, also reduced smoke index values. Similar re- sults using particle board were reported by Diammonium Phosphate and Ammonium Sulfate The flame retarding effects of DAP and ammonium sulfate (AS) on rate of spread and intensity for wood and fine fuel fires have been tested under controlled Findings show DAP to be most effective in slowing spread and reducing intensity. Two other differences between DAP and AS are apparent. The residue remaining after the tests is always much less from the AS treat- 2Thermogravimetric data on file at the Northern Forest Fire Laboratory, Missoula, Montana. 3H. W. Eickner and E. L. Schaffer. Fire-retardant effects of individual chemicals on Douglas-fir ply- wood. Fire Technol. 3: 90-104, illus. 1967. ment. For example, the residue from AS treated excelsior fuel usually is close to non- existent (fig. 1). The other difference is the tremendous amount of black smoke produced by DAP treatment as compared to the much smaller amount of whitish smoke produced by the AS treatment. Arthur D. Syska. Exploratory investigation of fire-retardant treatments for particle board. USD A Forest Serv. Res. Note FPL-0201, 32 p. 1969. 5 Charles W. George and Aylmer D. Blakely. Effects of ammonium sulfate and ammonium phosphate on f
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