Some physical properties of varnish coated wood preimpregnated with Copper-Chromated Boron (CCB) after 3 months of weathering exposure in southern eagen sea region

Abstract

This study evaluates weathering performance of Scots pine (Pinus sylvestris L.) and chestnut (Castanea sativa Mill.) wood specimens preimpregnated with copper-chromated-boron (CCB) before varnish coating such as polyurethane and an alkyd-based synthetic varnish. Varnishes were applied as coating or some containing paraffin was impregnated into wood as a water repellent. The wood specimens were then exposed weathering for 3 months at during autumn. After 3 months of weathering exposure; some physical properties such as surface hardness, color stability, water repellency, and mass loss of the wood specimens were tested. Wood surfaces preimpregnated with CCB showed enhanced resistance to natural weathering. Weathering performance of coated and treated wood specimens was remarkably increased as compared to that of noncoated and untreated wood specimens. Although, weathering softened both of the untreated wood species, all the treated surfaces were hardened after weathering exposure.