Abstract
This study evaluated fire and bending properties of blockboards with various fire retardant treated veneers. Blockboards were manufactured using untreated fir strips and sandwiched between treated ekaba veneers at final assembly. The veneers were treated with either boric acid (BA), disodium octoborate tetrahydrate (DOT), alumina trihydrate (ATH), or a BA/DOT mixture. Modulus of rupture and modulus of elasticity tests were performed according to European Standard EN 310. Blockboards were also tested for fire resistance as indicated by a cone calorimeter. Treatments had little negative effect on flexural strength; flexural stiffness was significantly lower for the highest treatment levels. Treatments resulted in a significant reduction in predicted flame spread rate.
Zusammenfassung
Untersucht wurden die Abbrand- und Biegeeigenschaften von Tischlerplatten, deren Deckfurniere mit unterschiedlichen Feuerschutzmitteln behandelt worden waren. Die Mittelschicht der Tischlerplatten bestand aus unbehandelten Tannenholzleisten. Die Decklagen bestanden aus imprägnierten Ekaba Furnieren. Die Furniere waren entweder mit Borsäure (BA), Disodium-Oktoborat-Tetrahydrat (DOT), Aluminium-Trihydrat (ATH) oder einer Mischung aus BA und DOT imprägniert worden. Festigkeits- und Steifigkeitsversuche wurden gemäss der europäischen Norm EN 310 durchgeführt. Das Brandverhalten der Tischlerplatten wurde mittels eines Kegel-Kalorimeters abgeschätzt. Die Behandlung der Furniere hatte einen geringen Einfluss auf die Biegefestigkeit, wohingegen die Steifigkeit bei den stärksten Behandlungsstufen signifikant verringert war. Die Imprägnierungen reduzierten die erwartete Flammenausbreitungsgeschwindigkeit signifikant.
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Laufenberg, T., Ayrilmis, N. & White, R. Fire and bending properties of blockboard with fire retardant treated veneers. Holz Roh Werkst 64, 137–143 (2006). https://doi.org/10.1007/s00107-005-0041-4
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DOI: https://doi.org/10.1007/s00107-005-0041-4