In this research, the utilization of small dimensions Chestnut wood (Castanea sativa Mill.) by finger jointing in the production of high-added-value products, was evaluated. Particularly, the effects of four finger lengths (4mm, 10mm, 15mm and 20mm) and of the orientation of the fingers on static bending strength properties (modulus of rupture and modulus of elasticity), were investigated. The finger jointed Chestnut wood was connected across the grain with a polyvinyl-acetate based adhesive, varying in durability class from D1, D2 to D3, according to EN 204:2001 standard.
Modulus of elasticity (MOE) of all the investigated joints was found to be slightly greater in mean values than that of the solid wood.
Modulus of rupture (MOR) of Chestnut wood joints ranged from 55.3 N/mm2 to 83.5 N/mm2, which corresponds to a percentage of 57.7% to 87.2% respectively, in relation to that of the control solid wood (95.8 N/mm2). It was found that the 4mm finger length led to the lower MOR values and the 20mm finger length to the higher MOR values, whereas, the samples with a horizontal finger orientation showed slightly higher MOR values, in relation to that of a vertical finger orientation. Also, it was found that the durability class of the PVAc adhesive affected significantly the MOR values. The use of the D1 adhesive led to the lower MOR values and the use of the D3 adhesive led to the higher MOR values, whereas, the D2 adhesive resulted in intermediate MOR values.