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Present Variability in Chemical Add-on in the Cellulose Insulation Industry

An estimate was made of the variability in chemical add-on which is likely to be typical of major cellulose insulation manufacturers. Twenty-three samples of cellulose insulation treated with various formulations were received from nine different manufacturers in different parts of the United States. Some of the samples were treated with Polybor sulfate alone, and others used formulations containing any or all of 5 mol borax, alum, lime, or sodium carbonate in addition. Prior to evaluating the samples for flame retardancy, the actual add-on was determined by chemical analysis. The results of the analyses are tabulated. The results of flame spread tests for varying amounts of boron compounds in cellulose are also presented. It is concluded that in the process of manufacturing cellulose insulation there are not only significant variations in the amount of chemical add-on while the plant is running, but there are also significant departures in the actual average amount of chemical add-on from the amount intended to be added. These variations complicate the task of evaluating the effectiveness of a given formulation during development, and their minimization should be a principal focus of a quality control program.