Effect of the bleaching and varnishing process on the flame source combustion light intensity of wood material

Abstract

This study was carried out to determine the impact of bleaching and varnishing on the flame source combustion light intensity of wood material. For this purpose, specimens prepared according to ASTM D 358 from European Oak, Oriental beech and Scotch pine wood are bleached with a solution of 18% sodium hydroxide (NaOH), hydrogen peroxide (H2O2), calcium hydroxide (Ca(OH)2), sodium silicate (NaSiO3), acetic acid (CH3COOH), sodium disulfide (Na2S2O5), oxalic acid (C2H2O4) and potassium permanganate (KMnO4). The bleached specimens are varnished with synthetic (Sn) water-based (Sb), polyurethane (Pü) and acrylic (Av) in accordance with ASTM D 3023. The light intensity were determined in accordance with ASTM E 160–50. Consequently; According to the interaction wood species, bleaching solution and varnish types, the most light intensity; synthetic varnished oriental beech bleached with KMnO4+Na2S2O5+H2O2 (R5), the least light intensity; acrylic varnished scotch pine, bleached with Na2S2O5+C2H2O4 (R4), were obtained. Accordingly, it can be suggested to consider this situation in application areas since the samples with the least light intensity can increase the risk of smoke drowning in fire.

Keywords

• işık yoğunluğu
• renk açma
• vernikleme
• ahşap malzeme
• light intensity
• bleaching
• varnishing
• wood material