In this study it was aimed to investigate the boron leaching amounts in Scots pine wood samples treated with boric acid (BA) and waste oil (WO) alone or by dual treatment. The level of water absorption and water repellent efficiency were determined with cyclical wetting tests, total of 336 hours. Wood samples that have both covered and uncovered transversal section were impregnated with 3% boric acid solution and then as a second step of the treatment, were treated with waste oil in the impregnation cylinder that applies vacuum and heat together. Oil treatments decreased water absorption to a level of 18% and increased water repellent efficiency of wood to a level of 80% compared to those of only boron treated and untreated control samples. Covering the transversal section with resin approximately halved the oil uptake and also helped to reduce the boron leaching from wood into oil during the oil treatment. Almost all boron content of only BA treated samples leached out (95%) after immersion of 14 days in distilled water. Boron treated and covered samples without oil treatment decreased boron leaching as nearly the same rate of oil treated samples did. Epoxy and oil treatment kept 35% boron inside wood after leaching procedure.

Download document (197 kb)
free for the members of IRG. Available if purchased.

Purchase this document