- Common Names
- Black Palm, Palmyra Palm
- Scientific Name
- Borassus flabellifer
- Origin
- Tropical Asia and Africa
- Appearance
- Black fibers embedded in a lighter tan or light brown colored body. Fibers are more densely packed toward the outside of the tree trunk, becoming more and more sparse toward the center of the tree. The center core of the tree is soft and contains none of the darker vascular bundles that give the wood its characteristic look and hardness. (This is nearly opposite of the typical outer sapwood/inner heartwood combination found in dicot hardwoods.) Black Palm has a medium to fine texture, though it is by no means even or uniform on account of the contrast between the dense, darker fibers, and the soft, lighter cellulose structure of the wood. Grain is very straight, and contains no growth rings, knots, or defects. Endgrain: Being a monocot, endgrain characteristics are non-typical when compared to more familiar hardwood dicots. Black Palm has a uniform distribution of black fibers embedded in a softer yellow/brown body of parenchyma. Growth rings, sapwood, and rays are completely absent. Endgrain exhibits a dotted pattern unique to palm trees.
- Avg. Dried Weight
- 61 lbs/ft3 (970 kg/m3)
- Janka Hardness
- 2020 lbf
- Modulus of Rupture
- 19,950 lbf/in2 (137.6 MPa)
- Elastic Modulus
- 2,262,000 lbf/in2 (15.60 GPa)
- Crushing Strength
- 10,190 lbf/in2 (70.3 MPa)
- Shrinkage
- Radial: ~5.5%, Tangential: ~5.5%, Volumetric: ~11.0%, T/R Ratio: ~1.0 (Weight and hardness is for the higher-grade outer material, not the inner material.)
- Durability
- Black Palm is reported to be durable regarding decay resistance, though it is susceptible to insect attacks.
- Workability
- Tends to be quite difficult to work with both machine and hand tools. The hard fibers contrast with the soft body of the wood, and can be brittle and splinter or pull out. Very sharp tools and correct cutting angles are required to get clean results. Applying a hardener or sanding sealer prior to final sanding/machining may help give a more homogenous density and reduce tearout. The lighter colored body of the wood tends to absorb larger quantities of finish, so care must be taken during finishing; a sanding sealer is recommended.
