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Effect of fire-retardant treatment of wood prior to thermo-mechanical densification
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-0869-5858
Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-0852-5066
Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia.ORCID iD: 0000-0001-9963-5011
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2024 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 19, no 3, p. 790-793Article in journal (Refereed) Published
Abstract [en]

Wood densification itself does not, in general, improve the fire-retardant properties sufficiently to reach the standard requirements. The object of this study was to enhance the fire-retardant properties of thermo-mechanically densified wood without any loss of moisture stability and hardness. Scots pine sapwood was pretreated before densification by impregnation with a fire retardant (FR) consisting of ammonium dihydrogen phosphate and urea and then cured in-situ by hot pressing at 150 °C or 210 °C. Densified specimens without FR were used as a control. Set-recovery, fire retardancy in an open flame test, and Brinell hardness were determined. The set-recovery was slightly reduced as a result of the FR treatment, but the pressing temperature and time had a much greater influence. In the open flame test, specimens without FR-treated ignited within 15-50s of exposure to the flame, whereas all the FR-treated specimens exhibited ignition resistance over the 10 minutes duration of the test. Water-soaking cycles had no impact on the ignition resistance in these groups, indicating a strong resistance to water leaching of FR after pressing at 210 °C for 60 minutes. The hardness increased due to the presence of FR after pressing at 210 °C, but sharply decreased after water immersion.

Place, publisher, year, edition, pages
Taylor & Francis, 2024. Vol. 19, no 3, p. 790-793
Keywords [en]
Wood compression, open flame, urea, ammonium dihydrogen phosphate
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-104919DOI: 10.1080/17480272.2024.2329734ISI: 001194237700001Scopus ID: 2-s2.0-85189563856OAI: oai:DiVA.org:ltu-104919DiVA, id: diva2:1847571
Note

Validerad;2024;Nivå 2;2024-11-13 (sarsun);

Full text license: CC BY-NC-ND;

Available from: 2024-03-28 Created: 2024-03-28 Last updated: 2024-11-13Bibliographically approved

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Scharf, AlexanderLin, Chia-FengSandberg, DickJones, Dennis

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