RESISTANCE OF WOOD PLASTIC COMPOSITE PRODUCED BY EXTRUSION AND COMPRESSION AGAINST THE FUNGI XYLOPHAGES POSTIA PLACENTA AND TRAMETES VERSICOLOR

Wood plastic composite constitute compounds of great demand like materials. Biological agents are one of the main causes of the deterioration of wood and its derivatives. Creating materials more resistant to these agents is an important task for the forestry industry.The objective of this research was to evaluate the resistance of wood plastic composite to the fungi xylophages Postia placenta and Trametesversicolor. The boards were obtained by means of two treatments (1-extrusion and 2-compression), was used Pinuscaribaea wood, thermoplastic polyethylene terephthalate, and calcium carbonate in proportions of 50-45-5. The loss of mass and dimensional stability in relation to thickness swelling was evaluated. This methodology carried out according to the American Society for Testing and Materials D 2017-81. Treatment 1 was classified as highly resistant, with mass loss of 6.41% for Postiaplacentaand dimensional stability of 3.75%, for Trametesversicolor it showed 4.15% mass loss, and 2.83% stability. The density of the board was affected in a measure of 20% for Postia placenta, and 23% for Trametesversicolor. Treatment 2 was classified as resistant, with 12% mass loss for Postia placenta, and 5.4% dimensional stability, for Trametesversicolor showed 10% mass loss and 4.6% dimensional stability.The density was affected in 30% for Postia placenta and 35% for Trametesversicolor. In relation to the controls, the density was affected in 8% for the treatment 1 and 10% for the treatment 2. The study provides new work aiming modifications of raw material to improve the board resistance.