Tannin extracts as a preservative for pine thermo-mechanically densified wood

Thermo-mechanical densification modifies wood to produce a more dense and resistant lignocellulosic material may degrade extractives that contribute the increased susceptibility of attack by xylophagous organisms. This study evaluated efficiency tannin extracts Acacia mearnsii in treatment thermo-mechanical densified pine relation physical, mechanical, biological resistance (Cryptotermes brevis) properties. Pinus elliottii samples were pretreated with oxalic acid Parr reactor, then treated diffusion solutions at concentrations 5, 10, 15%, finally hot pressed. The apparent density modified was 87.8% greater than natura (control) tannins 15%. mechanical strength increased, especially parallel compressive strength, which had an average increase 169% for 10 compared wood. There termite mortality reduction damage 15% tannins, obtaining best results physical parameters. Thermal preserved proved be potential alternative as high performance material.