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This paper presents the results of laboratory investigations of bonding high moisture content (15 %) birch veneers (Betula pubescens Ehrh.) with the use of modifi ed phenol-formaldehyde (PF) resin. Wheat starch, rye flour, resorcinol and phenol-resorcinol-formaldehyde resin were chosen as modifying agents. Dynamic viscosity, hydrogen ions concentration, solid content, curing time, pot life of developed adhesive compositions and shear strength of plywood samples were evaluated. ANOVA analysis has shown that type, mixture and content of modifying agents affect significantly the mechanical performance of plywood panels. The obtained results of shear strength values were above the standard requirements (1 N/mm2), and the properties of samples met the European standard EN 314-2 for gluing quality of class 3 and such plywood panels can be used in exterior conditions.U radu su prikazani rezultati laboratorijskih istraživanja furnirskih ploča proizvedenih od furnira od drva breze (Betula pubescens Ehrh.) s visokim sadržajem vode (15 %) i uz primjenu modifi ciranoga fenolformaldehidnog PF) ljepila. Pšenični škrob, raženo brašno, rezorcinol i fenol-rezorcinol-formaldehidna smola izabrani su kao sredstva za modifi ciranje. Analizirane su dinamička viskoznost, koncentracija vodikovih iona, sadržaj krute tvari, vrijeme otvrdnjavanja, otvoreno vrijeme smjese za lijepljenje i smicajna čvrstoća uzoraka furnirskih ploča. ANOVA analiza pokazala je da vrsta, smjesa i težinski udjel sredstava za modifi kaciju ljepila značajno utječu na mehanička svojstva furnirskih ploča. Dobivene vrijednosti čvrstoće smicanja iznad su standardnih zahtjeva (1N/mm2), a svojstva uzoraka furnirskih ploča zadovoljavaju europsku normu EN 314-2 za kvalitetu lijepljenja klase 3 koja se odnosi na furnirske ploče koje se mogu rabiti u vanjskim uvjetima

Properties of Modified Phenol-Formaldehyde Adhesive for Plywood Panels Manufactured from High Moisture Content Veneer