Effects of impregnation materials on combustion properties of laminated veneer lumber obtained from European oak (Quercus petraea Liebl.) and lombardy poplar (Populus nigra L.)

Abstract

The aim of this study was to investigate the impact of impregnation with boron compounds borax (Bx), boric acid (Bx), Bx þ Ba (wt : wt 50 : 50%), Imersol-aqua (Ia) and Timbercare-aqua (Ta) on combustion properties of the laminated veneer lumber (LVL) obtained from European oak (Quercus petraea Liebl.) and Lombardy poplar (Populus nigra L.) woods, impregnated with boron compounds, ImersolAqua, and Timbercare-Aqua according to ASTM D 1413-76-99 and directions of the manufacturer. The LVL samples were prepared in the form of five layers, of 3-mm thickness from the oak and poplar veneers according to TS EN 386. Combustion properties of the LVL test samples were determined according to ASTM D 160-50. Considering the interaction of combustion type and impregnation materials, the highest flame source combustion (FSC) and without flame source combustion (WFSC) temperatures were found in control test samples, but the lowest values in samples impregnated with Bx and Ia solutions. Consequently, borax in FSC and ImersolAqua in WFSC showed a decreasing impact on combustion properties of the LVL, produced combination of European oak and Lombardy poplar veneers, and bonded with Desmodur-VTKA. In consequence, the LVL impregnated with borax and Imersol-Aqua could be recommended as a flame retardance construction material where required.

Bonding strengths of poly(vinyl acetate), Desmodur-VTKA, phenol–formaldehyde and urea–formaldehyde adhesives in wood materials impregnated with Vacsol Azure

“…The lowest retention quantity was found in European oak. This may be due to tyloses in oak wood samples [25].…”

Combustion Properties of Impregnated and Heat-Treated Wood Material

“…As seen from Table 3, a general reduction was showed in the temperature and light density values after combustion test in impregnation solutions, while a little increased the combustion temperature and light density values in heat treatment. In a similar research, Keskin [3] was impregnated LVL woods obtained from European oak (Quercus petraea Liebl.) and lombardy poplar (Populus nigra L.) with boron compounds, Ia, and Ta solutions.…”

Impact of impregnation with boron compounds on combustion properties of oriental beech (Fagus orientalis Lipsky) and varnishes

“…High doses of boron compounds are the preferred method today. Keskin (2007) stated that, considering the interaction of combustion type and impregnation materials, the lowest thermal degradation values were obtained in samples impregnated with Bx and imersol-aqua solutions, containing 0.5% w/w tebuconazole, 0.5% w/w propiconazole, 0.1% w/w 3-iodo-2-propynl-butyl carbamate and 0.5% w/w cypermethrin. Borax in flame source combustion (FSC) and imersol-aqua in without flame source combustion (WFSC) showed a decreasing impact on the combustion properties of the laminated veneer lumber (LVL), produced by a combination of European oak (Quercus petreae Liebl.)…”

“…Borax in flame source combustion (FSC) and imersol-aqua in without flame source combustion (WFSC) showed a decreasing impact on the combustion properties of the laminated veneer lumber (LVL), produced by a combination of European oak (Quercus petreae Liebl.) and Lombardy poplar (Populus nigra Lipsky) veneers, bonded with Desmodur-VTKA (Desmodur-vinyl trie ketonol acetate) (Keskin, 2007).…”