In order to improve the acceptance of broader industrial application of flax fiber reinforced beech (Fagus sylvatica L.) plywood, five different industrial applicated adhesive systems were tested. Epoxy resin, urea-formaldehyde, melamine-urea formaldehyde, isocyanate MDI prepolymer, and polyurethane displayed a divergent picture in improving the mechanical properties-modulus of elasticity, modulus of rupture, tensile strength, shear strength and screw withdrawal resistance-of flax fiber-reinforced plywood. Epoxy resin is well suited for flax fiber reinforcement, whereas urea-formaldehyde, melamine urea-formaldehyde, and isocyanate prepolymer improved modulus of elasticity, modulus of rupture, shear strength, and screw withdrawal resistance, but lowered tensile strength. Polyurethane lowered the mechanical properties of flax fiber reinforced plywood. Flax fiber reinforced epoxy resin bonded plywood exceeded glass fiber reinforced plywood in terms of shear strength, modulus of elasticity, and modulus of rupture.

Department for Furniture and Interior Design Higher Technical College Hallstatt Lahnstraße 69 4830 Hallstatt Austria

Department of Wood Science and Technology Mendel University Zemědělská 3 61300 Brno Czech Republic

Faculty for Furniture Design and Wood Engineering Transilvania University of Brasov B dul Eroilor nr 29 500036 Brasov Romania

Forest Products Technology and Timber Construction Department Salzburg University of Applied Sciences Markt 136a 5431 Kuchl Austria

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