THE EFFECTS OF NATURAL WEATHERING ON HARDNESS AND GLOSS OF IMPREGNATED AND VARNISHED SCOTS PINE AND ORIENTAL BEECH WOOD

Abstract

The purpose of this study was to investigate the changes caused by natural weathering on surface hardness and gloss of Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) wood specimens impregnated with three different chemicals and coated with two types varnish. In this study, tanalith-E (TN-E), adolit-KD 5 (AD-KD 5), and chromated copper arsenate (CCA) were used as wood preservatives and then polyurethane (PV) and synthetic (SV) varnishes were applied to the wood surface. The surface hardness and gloss of wood specimens were determined after 3 and 6 months of natural weathering. After 3 months of natural weathering, results showed that while surface hardness values of solely varnish coated, and both impregnated and varnish coated wood specimens increased, surface hardness of untreated (control) specimens decreased. However, surface hardness values of untreated (control), and impregnated and coated wood specimens decreased considerably after 6 months of natural weathering. The gloss values of impregnated and coated, and untreated (control) wood specimens after 3 months of natural weathering were slightly low, and after 6 months of natural weathering, the decrease reached to the considerable level. After six months of natural weathering, the surface hardness and gloss loss of Scots pine and Oriental beech was the lowest in the TN-E impregnated and PV coated wood specimens.