Walnut - Dracontomelon
Walnut are among the most beautiful and most useful of all trees. For fine furniture, cabinets, and paneling, the beauty and quality of walnut wood are equaled only by mahogany and oak.
- The much prized heartwood of New Guinea Walnut is typically, wavy grained with dark grey to black bands or fine pencil-like streaks standing out from the paler colored and lustrous background. The sapwood is pale yellow in color and clearly defined from the heartwood.
- The timber itself is a distinctive yellowish- brown color, with a pinkish tinge, but is less hardy colored. The grain may be straight or interlocked and often wavy. It has a moderately coarse texture, and is without taste or odor.
- Walnut seasons well however, it has a slight tendency to warp in thinner sizes and to check if drying is hurried. Dried slowly, there is minimum degrade. There is moderate movement in service.
- The timber works and machines readily with a moderate blunting effect on cutting edge. Capable of a smooth finish but the interlocked grain tends to tear and pick up on quarter sawn faces and a reduction cutting angle to 20 degrees is usually beneficial. Due to its working capabilities it is useful for light framing, exterior cladding and joiner. It is also used for decorative veneers, linings, flooring, interior trim, moldings, turnery, furniture, cabinets and shop fittings.
Names
Family:
Anacardiaceae
Species:
Dracontomelon
D. puberulum Miq.
syn. D. mangiferum B1.
D. lenticulatum Wilk.
D. puberulum Miq.
syn. D. mangiferum B1.
D. lenticulatum Wilk.
Standard Trade Names:
PNG Walnut
PNG Walnut
PNG Walnut
Other Names:
Damoni, Dao (Pilippines), Dorea, Lamio, Loup, New Guinea walnut, Sengkuang (Malaysia) bau (Indonesia)
PROPERTIES
Density:
530-560 Kg/m3 @ 12% m.c
Colour:
Sapwood is pale yellow, heart wood grey brown with black streaks.
Texture:
Moderately coarse.
Grain:
Straight or interlocked, often wavy.
Figure:
Broken stripe figure on quarter sawn faces.
Durability:
Class 3: Moderately Durable
Permeability:
Class 4: Highly resistant; heartwood is untreatable and sapwood is comparatively narrow
WORKABILITY
General:
Easy to work and responds well to both hand and machine tools in wood working operations.
Sawing:
Readily sawn.
Planing:
Excellent, some care required where grain irregularities occur.
Blunting:
Moderate.
Boring:
Readily bored.
Turning:
Turns easily.
Nailing:
Nails well.
Gluing:
Glues well.
Finishing:
Excellent, stains and polishes satisfactorily.
MECHANICAL PROPERTIES
Strength:
SD6
Structural Grade:
F11 (select grade).
Hardness(Janka):
3.7kN (seasoned), 3.3kN (unseasoned).
Max. Crushing Strength:
46MPa (seasoned), 30Mpa (unseasoned).
Modulus of Elasticity:
11GPa (seasoned), 9.7GPa (unseasoned).
Modulus of Rupture:
81MPa (seasoned), 59MPa (unseasoned).
SEASONING
General:
Seasons well.
Movement:
Very low
Shrinkage:
Low
