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Aspen flakeboard treated with disodium octaborate tetrahydrateAuthor(s): Robert H. White; John Forsman; John R. Erickson
Source: Proceedings of the 19th annual conference on recent advances in flame retardancy of polymeric materials. Norwalk, CT : BCC Research, c2008: Pages 238-249.
Publication Series: Miscellaneous Publication
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DescriptionIn this project, we investigated mechanical properties and fire performance of aspen flakeboards manufactured with the fire-retardant chemical disodium octaborate tetrahydrate (DOT). Flakeboards were prepared using two levels of adhesive loading (5% and 7% methylene diphenyl diisocyanate (MDI)) and three levels of fire-retardant treatments (6%, 9%, and 12%). DOT is a well known fire-retardant treatment for cellulosic materials. In this study, DOT powder was added to the blend of adhesive and flakes during manufacture of flakeboard. To evaluate fire performance, specimens were tested in a cone calorimeter. Mechanical property tests included static bending, internal bond, and T-nut withdrawal. Three parameters of density, adhesive, and fire-retardant treatment had a statistically significant effect on the modulus of rupture, modulus of elasticity, internal bond strength, and T-nut withdrawal strength. Adhesive level was a statistically significant predictor of the 180 s and 300 s averages for the rate of heat release (p-values less than 0.05). The density was a statistically significant predictor of the 60 s heat release rate average, total heat release, and ignition times at the 0.10 significance level. Except for ignition times, fire-retardant treatment improved fire performance results. Except for the smoke extinction area, improvements in results from the cone calorimeter tests were poorer than expected for a viable fire-retardant-treated wood product. The literature suggests that better results for fire performance can be obtained by combining DOT with other fire-retardant chemicals or treating wood flakes prior to panel manufacture.
CitationWhite, Robert H.; Forsman, John; Erickson, John R. 2008. Aspen flakeboard treated with disodium octaborate tetrahydrate. Proceedings of the 19th annual conference on recent advances in flame retardancy of polymeric materials. Norwalk, CT : BCC Research: 238-249.
KeywordsFireproofing agents, flame spread, calorimetry, flexure, modulus of elasticity, elasticity, borates, waferboard, mechanical properties, particle board, aspen, adhesives, fire testing, density, fireproofing, disodium octaborate tetrahydrate, bond strength, fire retardants, methylene diphenyl diisocyanate, particle board, physical properties, bahavior in fire, fire hazard, heat release rate, ignition
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