Investigation on the Scratch Strength of Clear Paints Used in Furniture Industries on the Wood Species Beech, Elm, Alder and Spruce

In This research، the scratch strength (Cross-Cut Test) of clear paints (nitrocellulose lacquers and acid catalyst lacquers) of wood species Beech، Elm، Alder and spruce were studied as a function of moisture content (MC) of the samples. For this purpose، lumbers (550×110×12 mm) were cut from sapwood in tangential surfaces and were air dried for one month according to wood drying procedures. Then، for pre-conditioning of moisture content، at the levels of 8%، 12% and 15%، the samples were placed in three clima rooms. Then، finish applied and strength tests were performed. The results revealed that for acid catalyst lacquers the highest scratch strength (10. 4%) belongs to Elm wood with 8% moisture content، and the lowest scratch strength (53. 6%) belongs to Spruce wood with nitrocellulose lacquers having 15% moisture content.