Journal of Applied and Natural Science 6 (2): 338-343 (2014)
Dimensional stability and strength properties of wood plastic composites
produced from sawdust of Cordia alliodora (Ruiz and Pav.)
D. N. Izekor* and M. E. Mordi
Department of Forestry and Wildlife, Faculty of Agriculture, University of Benin P.M.B. 1154, Benin City, NIGERIA
*Corresponding author. E-mail: email@example.com
Abstract : This study evaluates the effects of densities and mixing ratio on the physical and mechanical properties of
wood plastic composites boards at mixing ratio of 1:1 to 1:1.4 and nominal densities of 700kg/mm3 and 800kg/mm3.
The quantity of High Density Polyethylene (HDPE) and saw dust used in the production of Wood Plastic Composites
(WPCs) was weighed to a nominal density of 700kg/mm3 and 800kg/mm3. The materials were thoroughly mixed and
fed into a neatly primed oil mould with a dimension of 300 x 300 x 10 mm. Test samples used for physical and
mechanical properties determination were collected from each board produced from the mould. The results showed
that WPCs board produced from mixing ratio 1:1 had the highest Modulus of Rupture (MOR) and Modulus of Elasticity
(MOE) values of 6.52 mm N-2 and 564.95 mm N-2 respectively. Water absorption, thickness swelling and linear
expansion of WPCs produced from wood/plastic ratio of 1:1.4 had the lowest mean values of 6.67, 0.83, 0.68% and
21.61, 1.33, 5.35% respectively after 2 hours and 24 hours of water immersion test. Analysis of variance carried out
at 0.05% probability level showed that the effect of density and mixing ratio were significant on the physical and
mechanical properties of wood plastic composites boards.
Keywords :Linear expansion, Modulus of elasticity, Modulus of rupture, Thickness swelling, Water absorption,
Wood plastic composites.