Physical and Mechanical Properties of Stems and Branches of Falcata [Falcataria moluccana (Miq.) Barneby & J.W. Grimes] Grown in Caraga, Philippines

Abstract

The physical and mechanical properties of branch wood from falcata [Falcataria molucanna (Miq.) Barneby & J.W. Grimes] grown in Caraga Region, Philippines were determined to assess suitability for end-uses such as core veneer and as material for light construction and handles and boxes as the stem wood. Tests done to compare the properties with the stem wood showed significant differences in relative density (average values of 0.284 for the stem wood and 0.255 for the branch wood) and shrinkage properties in all directions. Axial position significantly influenced variation in moisture content (p = 0.0024) for stem and branch wood, as well as relative density (p = < 0.0001) plus percent tangential (p = < 0.0001) and radial (p = 0.0014) shrinkage. For the mechanical properties, the stem wood end hardness was significantly higher by 28.8% at green condition (p = 0.0003) and by 13.36% at 12% MC (p = 0.0133) than the branch wood. The compression perpendicular to the grain at 12% MC of the stem wood was also higher by 16.10% (p = 0.0166). However, for the other mechanical properties studied, the differences were not significant. The bottom portion of the stem and branch wood exhibited the highest mechanical properties, which can be attributed to the higher relative density at this portion (p = 0.0001). Based on the results that showed insignificant differences in most of the properties between the wood types of F. moluccana, the branch wood can possibly be used for similar applications as the stem wood such as for light construction, non-structural veneer, and plywood; for tool handles, boxes, and other household items; and for pulp and paper. The utilization of the branch wood of F. moluccana, therefore, can augment the raw materials supply for the local wood industry.