Various samples of cellulose insulation were evaluated for flash-fire propensity, using the test method developed at the University of San Francisco. The samples included untreated cellulose insulation and insulation treated with various levels of 5-mol borax, boric acid, and mix tures of boric acid and 5-mol borax. Boric acid appeared to reduce flash- fire propensity most effectively, and a mixture of boric acid and 5-mol borax was less effective than either material used separately.
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