Silvanolin protective agent affectively protects wood against pests, but we do not know how to protect plywood, and how this protective agent affects adhesive and gluing. So we decided to impregnate veneers with Silvanolin, and glue veneers together in panels, to see mechanical and fungicidal properties. Veneers were pressure impregnated in a vacuum chamber. In a high press Meldur H97, melamine-urea-folmaldehyde adhesive, was utilised. To examine mechanical properties Zwick 100, according to standard SIST EN 314 for shear strength and SIST EN 310 for the module of elasticity and bending strength was used. Density was determined according to standard SIST EN 323, humidity to SIST EN 322. Fungicidal properties of impregnated and unimpregnated samples were analysed; so were the beech wood samples just for control. Thus all 3 samples were exposed to 3 mushrooms (Poria vaillantii, Trametes versicolir and Hypoxylon fragiforme) for 16 weeks in a growth chamber in accordance with standard SIST EN 113. We found out that mechanical properties of the samples were slightly better in protected samples than in unprotected ones. Measuring humidity we found out that the protected samples had higher humidity than unprotected ones. Density of the protected samples was also higher. In determining fungicidal properties we found out that the unprotected samples infested with fungi were much more attacked than those protected. So depending on the results of the test we concluded that the protected samples in all the cases had better properties than unprotected ones.