Diploma work deals with the analysis of the biological properties of particle board made from recycled wood, its utilization and the impact of biological factors on chipboard and recycled chchipboard where we had samples of the control, commercial, variant 1, variant 2 and fancy veneer. Where variant 1, variant 2 contains a sample 100 % recycled, the sample 50 % - 50 %, the sample 80 % - 20 % recycled.By examining the changes where we bud grafting fungi on the sample, we determine their resistance to mildew, influence of the sterilization process. Confirmed the increased susceptibility of chipboard recycled samples to challenge the fungus in comparison with the commercial samples. On the tracked changes in the most reacted samples which were from fancy veneer.