Abstract
The rate of loss of the chemical fire retardant, boric acid, from loose-fill cellulosic insulation due to sublimation has been determined. Apparent sublimation pressures for boric acid have been measured as a function of temperature and relative humidity using a flow system. A direct determination was also made of the rate of mass transfer of boric acid in cellulosic insulation to the air above the insulation. These data were used in a numerical model to show that the loss of boric acid from cellulosic insulation is insignificant at 70 °C and relative humidity near 100%. The redistribution of boric acid and borax in a commercial cellulosic insulation due to vibration was studied by analyzing specimens taken from the top and bottom of horizontally applied material. Long periods of vibration failed to result in statistically significant chemical redistribution.
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