The mechanical properties of urea-formaldehyde particle boards obtainable from resins-sawdust filler compositions in terms of stress-strain relationships, percentage elongation (%E) vs. percentage composition (%C), Load vs Extension, Tensile Strength (TS) vs Percentage Composition (%C) and % Elongation (%E) vs Breaking Load were monitored, when the sawdust samples were treated with various resins concentrations: 22%, 24%, 26%, 28%, 30%, 32% and 34% at 65-70ºC with 20 tons pressure. The samples were cut into sizes of dimensions: 100mm x 10mm x 5mm and their mechanical properties were analyzed. A gradual increase in mechanical properties was observed from 22% to 30% urea- formaldehyde resins concentration, but at 32% and 34% compositions, increase in resins concentrations in the sawdust did not significantly affect the mechanical properties of the particleboards obtained. A comparison between the various compositions showed that 30% urea- formaldehyde resins compositions have better mechanical properties.

Keywords: particleboards, urea-formaldehyde, stress-strain relationships, resin composition, sawdust concentration, modulus of elasticity, tensile strength.