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DAO (Dracontomelon dao)
Trade Name
Dao
Scientific Name
Dracontomelon dao Merrill & Rolfe
Family
ANACARDIACEAE
Common Names
Dahu besar daum (Indonesia); Sengkuang (Malaysia); Sengkuang (Sabah); Sengkuang (Sarawak); Dahu (Indonesia); Sengkuang (Borneo); Mon (Papua New Guinea); New Guinea walnut (Papua New Guinea); Sarunsab (Sabah); Unkawang (Sarawak); Sengkuang (Malaysia); Maliyan (Philippines); Basuong (Indonesia); Ka-kho (Thailand); Sengkuang (Indonesia); Basuong (West Irian); Dao (Philippines); Sang-kuan (Thailand)
Scientific Name Synonyms
Dracontomelon sylvestre Blume; Dracontomelon puberulum Blume; Dracontomelon mangiferum Blume; Dracontomelon edule (Balnco) Skeels
Description Of The Tree
Botanical Description
It is a large tree up to 45 m tall. The bole is branchless for up to 20 m, up to 100 cm in diameter, with narrow buttresses up to 6 m high.
Natural Habitat
Dao occurs in primary or secondary evergreen to semideciduous forests, from the sea level up to 500 m of altitude.
Natural Distribution
It is widely distributed in lowland New Guinea, New Britain and New Ireland as well as in the Philippines, Malaysia and Indonesia.
Wood Identification
Anatomic Description Of Wood
Tangential diameter of vessel lumina 200 micras or more (large). Tyloses common. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits coarse throughout the ray cell. Intervessel pits large, 10 micras or more. Axial parenchyma lozenge-aliform. Axial parenchyma confluent. 4 to 10 rays per mm (medium). Prismatic crystals in the ray cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Septate fibers present. Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Odor
It has no taste or odor.
Color
The sapwood is pale yellow, clearly defined. The heartwood is walnut brown, grayish-or greenish-yellow.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
The grain may be straight or interlocked.
Texture
Texture is reported to be medium to coarse.
Luster
This species is moderate in luster.
Natural Durability
This timber is not resistant to termite or marine borer attack.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Internal Growth Stresses
Tension wood is sometimes present, giving rise to a slight woolly surface on sawn material.
Silica Content
Silica Content: It is non-siliceous. Silica Value: 0
Resistance To Impregnation
The penetration of both sapwood and heartwood by preservatives evident is unsatisfactory.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.60
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.66
Total shrinkage Tangential (Saturated to 0%MC) (%)
7.9
Total shrinkage Radial (Saturated to 0%MC) (%)
4.0
Drying Defects
Drying Defects: It is reported that in seasoning the wood is liable to sap-stain and is subject to insect attack.
Recommended Dry Kiln Schedule
JP-25
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.0
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1029
Stiffness (MOE) 12%MC (kgf/cm²)
127986
Compression parallel to fiber 12%MC (kgf/cm²)
510
Compression perpendicular to fiber 12%MC (kgf/cm²)
92
Shear strength radial 12%MC (kgf/cm²)
112
Janka hardness (side) 12%MC (kgf)
513
Janka hardness (end grain) 12%MC (kgf)
569
Workability
Sawing
It is easy unless hindered by interlocked grain.
Rotary Veneer Cutting
It is useful as decorative veneer, and is easy to peel without pretreatment at a peeling angle of 91 degrees for 1.5-mm thick veneer.
Sliced Veneer
It is useful as decorative veneer, and is easy to peel without pretreatment at a peeling angle of 91 degrees for 1.5-mm thick veneer.
Machining
Machining is easy if interlocked grain is not excessive.
Planing
Planing of this species is reported to be easy.
Turning
30
Nailing
This wood is easy to nail.
Gluing
Gluing of this species is easy.
Finishing
Wood of this species is easy to finish.
Polishing
This species is reported to be easy to polish.
Response To Hand Tools
It is easy to work with hand tools.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, flooring, panelling, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, Decorative veneer, TURNING, NAVAL CONSTRUCTION, OTHER AND MUSICAL INSTRUMENTS, handicrafts, matches, moldings
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Furniture, Luxury
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Cabinet
- 24 - Empire Timbers
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Decorative veneer
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
Turning
- 30 - Embassy of Honduras in Japan
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Other & Musical Instruments
- 63 - Madeiras do Brazil II
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Matches
- 71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement
Molding
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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