In accordance with the development and directives of environment protection, protection procedures were developed, which are less harmful to humans and nature, but nevertheless, efficiently protect wood against biotic factors of decay. For the purpose of wood modification, water soluble resin dimethylol-dihydroxyethyleneurea (DMDHEU) is being developed, and is already used for many years in the textile industry for modification of cellulose in cottons textile. The aim of this research was to check if the wood, modified with this agent, also known under the brand name Meldur, is resistant to wood decay fungi. In accordance with the modified SIST EN 113 standard, the modified samples of wood were exposed to 4 different species of wood decay fungi. Spruce wood samples were exposed to Gloeophyllum trabeum and Antrodia vaillantii, while beach ones to Trametes versicolor and Hypoxylon fragiforme. The modified samples showed effective resistance against Gloeophyllum trabeum and Antrodia vaillantii. At beach wood, exposed to Trametes versicolor, the mass loss of samples, modified with 5 % and 10 % concentration of Meldur at modification temperature 150 °C, was below 3 %. Modified beach samples, exposed to Hypoxylon fragiforme, did not exhibit any resistance against fungal degradation, and sometimes lost even more mass as control samples. The results showed that the agent Meldur is resistant to brown rot fungi, while it is less effective against white rot fungi.
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