Journal of Coatings Technology and Research, vol.1, no.3, pp.219-224, 2004 (SCI-Expanded)
The impacts of impregnation and bleaching on the varnish layer hardness of Oriental beech (Fagus orientalist L.) wood were investigated. A number of bleaching combinations {[NaOH-H2O2, [NaOH-Ca(OH) 2-H2O2], [NaOH-MgSO4-H 2O2], [NaHSO3-H2C2O 4], [NaSiO3-H2O2], [KMnO4 + NaHSO3 + H2O2]} were applied at 18% concentration for bleaching to both impregnated and unimpregnated specimens of Oriental beech wood. Subsequently, water-based (WB) varnish was coated over the samples and the varnish layer hardness values were determined in accordance with ASTM D 4366-95. All of the chemicals used for bleaching reduced the surface hardness. However, after varnish coating, the hardness of most samples was similar to that of the varnish-coated natural (control) samples.