Durability against termite Coptotermes formosanus Shiraki of sawnwood of Lithocarpus ducampii and veneer of Litsea pierrei treated with preservative

Abstract

Red chestnut and Boi Loi are indigenous plants which relatively grow quickly and possess a beautiful grainy texture, so they have great potential in the processing of wood products and furniture. The study of natural durability show that wood from these species have moderate durability against termite and poor durability against wood-decaying fungi during processing and utilization. Therefore, to improve their wood quality, the study of preservation of wood from Red chestnut and Boi Loi is necessary. The results from laboratory testing show that soaking impregnation of sawnwood and veneer from Boi Loi and Red chestnut respectively with the preservative LN 5 at concentrations 5 -7% during 30 minutes, 60 minutes, 90 minutes, 24 hours, 48 hours and 72 hours all give good effectiveness against termites. Dipping peeling boards of Boi Loi with the preservative BORAG2 for 20 seconds to 10 minutes and dipping the sawn wood of Red chestnut and Boi Loi for 5 minutes to 15 minutes are also effective in resistance gainst termite.