Ignition inhibitors for cellulosic materials. [Fire retardants; effects of irradiation]

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By exposing samples to various irradiance levels from a calibrated thermal radiation source, the ignition responses of blackened alpha-cellulose and cotton cloth with and without fire-retardant additives were compared. Samples treated with retardant compounds which showed the most promise were then isothermally pyrolyzed in air for comparisons between the pyrolysis rates. Alpha-cellulose samples containing a mixture of boric acid, borax, and ammonium di-hydrogen phosphate could not be ignited by irradiances up to 4.0 cal cm/sup -2/ s-1 (16.7 W/cm/sup 2/). At higher irradiances the specimens ignited, but flaming lasted only until the flammable gases were depleted. Cotton cloth containing a … continued below

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7 pages

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Alvares, N. J. April 5, 1976.

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  • Lawrence Livermore Laboratory
    Publisher Info: California Univ., Livermore (USA). Lawrence Livermore Lab.
    Place of Publication: Livermore, California

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By exposing samples to various irradiance levels from a calibrated thermal radiation source, the ignition responses of blackened alpha-cellulose and cotton cloth with and without fire-retardant additives were compared. Samples treated with retardant compounds which showed the most promise were then isothermally pyrolyzed in air for comparisons between the pyrolysis rates. Alpha-cellulose samples containing a mixture of boric acid, borax, and ammonium di-hydrogen phosphate could not be ignited by irradiances up to 4.0 cal cm/sup -2/ s-1 (16.7 W/cm/sup 2/). At higher irradiances the specimens ignited, but flaming lasted only until the flammable gases were depleted. Cotton cloth containing a polymeric retardant with the designation THPC + MM was found to be ignition-resistant to all irradiances below 7.0 cal cm/sup -2/ s/sup -1/ (29.3 W/cm/sup 2/). Comparison of the pyrolysis rates of the retardant-treated alpha-cellulose and the retardant-treated cotton showed that the retardant mechanism is qualitatively the same. Similar ignition-response measurements were also made with specimens exposed to ionizing radiation. It was observed that gamma radiation results in ignition retardance of cellulose, while irradiation by neutrons does not.

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  • American Chemical Society meeting, San Francisco, CA, USA, 29 Aug 1976

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  • Report No.: UCRL-78026
  • Report No.: CONF-760826-4
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 7345420
  • Archival Resource Key: ark:/67531/metadc1449976

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  • April 5, 1976

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  • Feb. 10, 2019, 8:45 p.m.

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  • May 3, 2019, 6:19 p.m.

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Alvares, N. J. Ignition inhibitors for cellulosic materials. [Fire retardants; effects of irradiation], article, April 5, 1976; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1449976/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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