The aim of this research was to determine the effects of bleaching chemicals on the bending strength of wood. For this purpose, sodium hydroxide + hydrogen peroxide, sodium hydroxide + calcium hydroxide + hydrogen peroxide, hypochlorite and hydrochloric acid were applied to pine (Pinus sylvestris L.), oriental beech (Fagus orientalis Lipsky), ash (Fraxinus excelsior L.) and oak (Quercus petraea spp.) for bleaching. | Tr. J. of Agriculture and Forestry 23 (1999) 615-619 © TÜBİTAK The Effects of Wood Bleaching Chemicals on the Bending Strength of Wood Burhanettin UYSAL Yüzüncü Yıl Üniv. Van Professional College, Furniture and Decoration Department, 65080 Van–TURKEY Musa ATAR, Ayhan ÖZÇİFÇİ Gazi Üniv. Faculty of Technical Education, Furniture and Decoration Department, Ankara–TURKEY Received: Abstract: The aim of this research was to determine the effects of bleaching chemicals on the bending strength of wood. For this purpose, sodium hydroxide + hydrogen peroxide, sodium hydroxide + calcium hydroxide + hydrogen peroxide, hypochlorite and hydrochloric acid were applied to pine (Pinus sylvestris L.), oriental beech (Fagus orientalis Lipsky), ash (Fraxinus excelsior L.) and oak (Quercus petraea spp.) for bleaching. The results indicate that the hypochlorite and hydrochloric acid solutions caused the greatest decrease in the bending strength of the woods used in the experiment. Renk Açıcı Kimyasal Maddelerin Ahşap Malzemenin Eğilme Direnci Üzerine Etkileri Özet: Bu çalışmada sodyum hidroksit + hidrojen peroksit, sodyum hidroksit + kalsiyum hidroksit + hidrojen peroksit, hipoklorit ve hidroklorik asit ile rengi açılmış sarıçam (Pinus sylvestris L.), Doğu kayını (Fagus orientalis lipsky), dişbudak (Fraxinus exclsior L.) ve sapsız meşe (Quercus petraea spp.) odununun statik eğilme direncinde meydana gelen değişmeler incelenmiştir. Deneyler sonucunda; en fazla eğilme direncindeki azalmaya asidik karakterdeki hipoklorit ve hidroklorik asit çözeltileri neden olmuştur. Introduction Each type of wood has its own variation of color, texture and grain pattern. Some cuts of solid wood and flitches of veneer may be lighter or darker than others. To obtain a uniform color for use in furniture, the choice is generally limited to a color equal to or darker than the natural color of the wood. The only way to avoid this darkening is to bleach the wood or use a bleaching toner on the
